Malicious PDF — malware analysis report

Static analysis result for SHA-256 660013eff141c623…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 19:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a52e222358bfb00860bf4bbcb640a013 SHA-1: 714d4bf4fe3f4cca21d33bda9b086d0460674af7 SHA-256: 660013eff141c623dbecf1d9e3e26cb6848c54ea4c7101bd85a893c92abc23ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to deliver a second-stage payload. The presence of invoice or payment language further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://infrive.ru/uplcv?utm_term=r+and+ac+textbook+pdf PDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b446617---rawafopu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/21b7205f00dc39e8cc86a756a2bbd213/giranojuromijatodewuda.pdfIn PDF document text
    • http://chennothinterios.com/uploads/file/47922655648.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1frultsb99d554m0lpnajd69n8/89495011310.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091caefdef96---61641981431.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a8a7a5f5d---58883697044.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/lofizafovusalozuviropig.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9r4rphnudi92ngg9ahrhb8irqf/93654971443.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1eb7fd7e---vajixoja.pdfIn PDF document text
    • https://agatanorek.com/files/file/vukekagijeka.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e876c2a33f---54616151224.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lgee19q1tmahvahgcfpjfhggt4/44237332326.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/55683402756.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2imr10bpdbtmndqk1fc38h74kh/ziferilukakofomiruzujav.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e078feede3---56604433247.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a78a53c9f667fb10ba1685b633b3158c/52699638527.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/826c6bbf8fabf0fcb0295bb5398811d5/12870161264.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/98877821717.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88b651c1f---48685340290.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d33ae98e2627c09878ac85ff238c41a8/rabip.pdfIn PDF document text
    • https://angkagenap.com/contents//files/gerekukexumadurulelon.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.

FilenameKindSourceSize
font_00_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 17908 bytes
SHA-256: 381194a1d0b5fcbef56496fc94d229f945b92090a845798c6fd9358adb687765
font_01_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 10584 bytes
SHA-256: 98d94c4a243adcbbab2ec4da1ea76f60ab6a7d14918d50e43975b0a99b69eb17

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