PDF malware analysis — malicious · 8de7042b6b750a55

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 02:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8eaabac7bbab4e973a43dfb0bfba03cd SHA-1: e5deb14e5f2db35c2b220945444df0cb7813db12 SHA-256: 8de7042b6b750a5592f68589fc05678ff7c38bf6d2c94e453e432aab3c996829

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
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://philabc.ru/uplcv?utm_term=4+stages+of+the+demographic+transition+model PDF link annotation
- https://rozgarnetwork.com/ckfinder/userfiles/files/bijosodi.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1daf2fcb64cda0f2f78776dc9b8b9976/1552879350.pdfIn PDF document text
- https://bandotrading.com/uploads/file/83080738492.pdfIn PDF document text
- http://boathousebrokerage.com/userfiles/file/winojatuzomudile.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a982c74f691---ritugerezojonifipos.pdfIn PDF document text
- http://ed-web.cz/userfilesfile/ladaxekupabunolizar.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fc571cad306fddddc77c60e84b813bf/mebunevuriranusename.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b780e15d853---82225333107.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ce7ab4e29f2a48a8aa7d3efd3987f6c1/xegolo.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9b8cef347695055f1fe41fe8a40fda0f/lononumemofo.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0db0cf6ac---bovewitefatodek.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe9d7618b---38990254993.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0d424bee8157827c616f5851a1b6236e/ramux.pdfIn PDF document text
- http://eaas-journal.org/survey/userfiles/files/73267583660.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c7ae92f1---87168326898.pdfIn PDF document text
- https://africanresearchcenter.com/userfiles/file/vepowebojananidib.pdfIn PDF document text
- http://njf724.com/basefile/janatalnajafcom/files/8468121164.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ac20111e---vomoropelibal.pdfIn PDF document text
- http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2c7c2dcfcfd3a6bf01ba96ee7aa02e2c/96328098781.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7gt3qk3m957rof99if453jaoa7/leleruzorurewanekok.pdfIn PDF document text
- http://mg001.cn/upload_fck/file/2021-6-21/20210621125900188807.pdfIn PDF document text
- http://bukharageorgia.com/sites/default/files/file/resinixadok.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/88830baf31162a09db55b5e455b486a4/rakome.pdfIn PDF document text
- https://riolospettacoli.it/filesUploads/file/30204635609.pdfIn PDF document text
- https://whitesal.com/data/images/file/1457_20210518135052.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/84632bc179ebf29e3d29fa504862812a/92537170988.pdfIn PDF document text
- 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_off0000f2b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2B2	11048 bytes
SHA-256: `41c0b5eba07ad4f6079871ece613bba83c7d5fe068619cbf6af57e8b0a700f72`
`font_01_sfnt_off00010bfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BFA	17584 bytes
SHA-256: `0dffeb37f08b440fdbb873f30f1cc1545331b7918da25bd1317737acb7438973`
`font_02_sfnt_off00013a0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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