PDF malware analysis — malicious · 96a1c472af8aec0c

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 07:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 733cb4a97a021ad808235406bdee86bc SHA-1: 9bc9b9e95eb4e06be96d93734ebba531171c64d4 SHA-256: 96a1c472af8aec0c5cc825a202c8d901df427aede85dbdff665222f98c867e81

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a malicious document, including multiple heuristic firings related to compromised CMS uploads and link farms. The presence of numerous external URIs, many hosted on potentially disposable domains, suggests an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to malware delivery or phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 8

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 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.
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://irlanc.ru/uplcv?utm_term=mcq+questions+for+class+11+physics+with+answers PDF link annotation
- http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10318265753.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3bfd3e391a0ed0a35b89851824c42d3c/45231072785.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160703c28724a5---75196102707.pdfIn PDF document text
- http://ambvetsanprospero.eu/userfiles/files/ligukoxasikatomu.pdfIn PDF document text
- https://namhunglogistic.vn/site/files/29530355306.pdfIn PDF document text
- https://west-holding.com/userfiles/file/79501591543.pdfIn PDF document text
- http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ddeee8224---81278341227.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a4e1013f40f833c236cc5fcc60181e4c/pasawewisazit.pdfIn PDF document text
- http://auburn-companies.com/userfiles/files/48716106743.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bbcbf047d340df4bf58218baee80c99c/97405199380.pdfIn PDF document text
- http://kbo.pl/ckfinder/userfiles/files/sozudisotesewewobudoti.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9u59ohpqe4lcjq68rhjtq4io94/nuwof.pdfIn PDF document text
- http://farmina.ru/uploads/files/20003713460.pdfIn PDF document text
- https://mimpi1pusat.com/contents/files/81312549233.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48e0a0b317f7b59a73d1e6d8b791e1e0/89831937396.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58f5724d4---52701740486.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2gtcci3tjqvs87hhu7vvd9eia6/51801561083.pdfIn PDF document text
- https://holocaustresearch.pl/nowy/photo/file/gowefapovolixaxopegavin.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c773a70167d---41631349274.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee024253aa9.pdfIn PDF document text
- http://dokumsuzgec.com/userfiles/files/35288680599.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075890f9d---sawexagotekigowake.pdfIn PDF document text
- http://jewelry-shopping-city.com/uploads/files/202108160758481807.pdfIn PDF document text
- http://artsar.pl/userfiles/file/verun.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/503470b1ff1debe474e5ca5d5d13dec9/nijunipa.pdfIn PDF document text
- http://jingluo.net/uploadfiles/files/xilawupuwugepisulizo.pdfIn PDF document text
- http://angelojrobles.com/admin_initial_test/userfiles/file/paporoxuvuxiso.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_off0000ee89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE89	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000106a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106A0	11068 bytes
SHA-256: `af1f586d3225c93eca0b271c76747d4f8b0e01cbdaa272990ab84fe32a087bb2`
`font_02_sfnt_off0001207d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1207D	17872 bytes
SHA-256: `d605d38cc4cebc91419a399523c061d4ac7ee67b57cada91e91288d3f7c3be91`

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