Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ea8c9303604618…

MALICIOUS

PDF

78.6 KB Created: 2021-06-26 10:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7ea46dedf885a8b01ee1e767a0fc1e9b SHA-1: 20c21cd613320234fb3e5d239134fa8058d9edb0 SHA-256: 57ea8c93036046183f989bd7e4fe37a263f062e9e312d4c538d4644b28ae5136
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document containing a link farm, with many URLs pointing to compromised WordPress installations and disposable hosting. These links are likely used to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=down+to+a+tee PDF link annotation
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/5rkifnl7d76vju16ig86m9ksbe/radasadudifedesivoxasekes.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b83f4690e7f---tozokaxixutor.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/miwok.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b953c1354---27901991285.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608361a3035a6---gixaxesukirurufofijolove.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205cf6d214---74394662715.pdfPDF link annotation
    • https://feniks9.ru/ckfinder/userfiles/files/nebomozonif.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bfe0b0256---1860364487.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/s0dgblvsiemva1kh7r78h2n6df/51406618207.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5b561efa64ec18a7cd6c37269321289d/suxawimi.pdfIn PDF document text
    • http://azizolace.cz/images/file/95586976320.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607391f7d3685---kumokupijumapaxoxerofojed.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/jovutekavadoxa.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/99dba9cc85d296dc319da29eb5da1d4e/begamuvunewimasenenoba.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ced40053---vaxobejomofasefugu.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/82531429681.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/diduvinemak.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/linb9i40l96s6nvb4nrc2a2as4/rosej.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/sutugemug.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bjo2bh7dpa19ud6j9e5ck88en2/kukafogumurajamudozokagir.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d91451cf0---969991015.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/63260632061.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/99bae06eb9f5e5f2686a30568db31285/vofizolez.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/tudejevisamalifeze.pdfIn PDF document text
    • https://scriptdd.com/_file/file/85062496430.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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 9780 bytes
SHA-256: f92c33f138e6b948983c36cbd4f15d15733a47bb9d8c1af7694364f83a743840
font_02_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 20328 bytes
SHA-256: 693931cd8ba7bc46a227ff1612c5d35693399b496bade46d9ed6005bfa2a8705

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