PDF malware analysis — malicious · 98a2431a90340554

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 08:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: d9ad2474577cb81bfec3cd28b4f9d98e SHA-1: 09b73cfac97979f499066a07155c729a82c8eb9c SHA-256: 98a2431a903405547cfc741c881c718d9ae29ef91add5c9d9754ae49e63a948e

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation Suppression

The PDF contains embedded JavaScript and multiple links to external resources, many of which point to compromised WordPress installations. The heuristic 'SE_SECURITY_BYPASS' indicates the document instructs the user to disable security software, a common tactic in phishing and malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lead the user to download a secondary payload or provide sensitive information.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

Heuristics 9

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/k90eseudto6fo2rof840iqhl48/vuxirovituzulugogepufujow.pdf In PDF document text
- https://imahima.xyz/js/ckfinder/userfiles/files/83431330733.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/84a286de91414e2d05154b17d82463fe/9548052783.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/arbjbedblventeg89k8gobhgv3/20577625725.pdfIn PDF document text
- http://angelojrobles.com/admin_initial_test/userfiles/file/fuzavegijunovinitabana.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1mk51bhfmpapeii10usvn7eos3/zozozazaraseme.pdfIn PDF document text
- http://euro-ex.com/images/blog//file/girodebovezuzeferisosamu.pdfIn PDF document text
- https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a9230c9e3a35d937360cc2afd667f15b/21673356439.pdfIn PDF document text
- https://camgloberealtor.com/userfiles/file/nakoxenuxi.pdfIn PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/p8h8b6m2leiiflic82kt2l2810/52496163429.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991568297bd---92812808574.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a4ceefb3---96612823922.pdfIn PDF document text
- http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737cedaea5---92258791589.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073db824e8d5---13225330532.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e851de0b64f5d956ee20b779b2364dd6/godubev.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/be017fbf95b26529e3d061e4ff52d869/36781077755.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75201cec7---73908387755.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7da1eac16e6f0461edd0736993f020f0/fekasu.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/zazemevimad.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0652daf0---12683509676.pdfIn PDF document text
- http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6phk9c8je459bifpp8mcn1etpv/12365079211.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1904ba1c37b070535505d749ebdf999a/93649217921.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=problems+found+your+computer+appears+to+be+correctly+configuredPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e4a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4A8	11316 bytes
SHA-256: `f4f2e602fa4070908eb045cb2f369fa2ff9334028bb0db1f4c09d4547c1293d6`
`font_01_sfnt_off0000fedb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEDB	17728 bytes
SHA-256: `a8bfe748c484c4a070941e930aaef2cba65f650f8fb0829dd616cd960119dc98`
`font_02_sfnt_off00012da6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DA6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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