Malicious PDF — malware analysis report

Static analysis result for SHA-256 035c00c752874dd2…

MALICIOUS

PDF

89.1 KB Created: 2021-07-13 11:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7caa44e818f581688b3eae84c9a657e6 SHA-1: 9b335ad240ef042923de99433ca3167cafceadaa SHA-256: 035c00c752874dd28df87e249253a46f95598eee6854780f7a37de0624cb8d41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160782d13a5e08---82416154130.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac381d2dd58---baxosadinabapibuzejilori.pdf
    • http://vako.vn/app/webroot/uploads/files/80693586704.pdf
    • http://vistobrasil.net/uploads/file/88750043651.pdf
    • http://www.irrv.org/uploads/files/81500896844.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1iencujqotqrhih5oato4to33j/49356565852.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gixolafexi.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6e3b71b97c984a2d5f6ed3d3b2ab6d6/10238478297.pdf
    • http://musikpark-live.de/userfiles/file/4250027584.pdf
    • http://delve-cr.com/uploads/kudakuke.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54afba9b1---86523824868.pdf
    • http://abpaluso.com/upload/file/tokotuduxuxuwafaru.pdf
    • https://pet-fashion.ro/mm/file/nafivusedolerelaf.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2622e5c3---52420891311.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/632d4e4075ed7da5888265e10adb6af6/32498784960.pdf
    • http://hyundai-baoloc.com/luutru/files/73506643758.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160738abb1f630---fopozepikofexefe.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f132c501229c3dfe3fe8be614ef2eef7/wobatiterapuberirebivunar.pdf
    • http://ilovechardonnayhills.com/userimages/55212521077.pdf
    • http://al-bandak.com/userfiles/file/sawasovobawuserun.pdf
    • https://callalilyvn.com/upload/files/64367878083.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca21a570b---64401739487.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607173cb1fb32---furomozimub.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d43d38997---34452808298.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+can+i+use+as+a+substitute+for+red+wine+vinegar
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f785.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16792 bytes
font_01_sfnt_off00010f9c.bin
2c0fca332378f600f3adb8f2031a4a7fad34c788c7c0b1fe1ad76ed69c8ed1e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 11096 bytes
font_02_sfnt_off00012948.bin
4e3cf9321290844c74745d9ae0b25dc5d8459c5e2cb26f7284a5d98b8af95889
pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 17388 bytes