Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fedc77ee4488c0…

MALICIOUS

PDF

106.5 KB Created: 2021-09-02 07:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88a052837c52844adf9c0204ca6bb0af SHA-1: be6523d5f2a556488d6e9c94a2a68a8b60486254 SHA-256: a5fedc77ee4488c024dc7251f03e852e91ce0621f8079003eb7b7a463c3e5916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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 http://abwjefferson.com/uploads/files/madedabiluse.pdf In PDF document text
    • http://doingthing.com/downloads/blog/geust/files/14349154140.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d7c80d3e4701d4e46957da42522def96/40235983914.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f82105bc0527f7856ec9894c8dd3a676/filarawixafigetopapev.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad7bceeb2---34960605593.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ba2ce5d6ec2f70ef0e45d658fd0711ae/powiguxeku.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/96037059826.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1ce3afc63419a33a3bc0b86daf1ee073/91782740701.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/91262490080.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/46541624576.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dgc8h1n3kpl2kh0d68c1tja9vf/zalaxuvev.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/xamexime.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/70026701171.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/bukapufabeken.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/rolifurowepofetizobububa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a753916624e---84606681714.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/zepamojevajibizajojir.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc67d01f5---borapidolaxapusulogibiw.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be19c04c98---62824466041.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/661cb58b8f0dec37f38fc0772b373095/nivizafobezikenajobisu.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/kitibiginubomulisudejaja.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e932634131c---xowuroxuzedakafitali.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d374ade8---jemulutere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=maya+angelou+poetry+themesPDF link annotation
    • 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_off00013bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DC 18388 bytes
SHA-256: 65af3521b4a7e7fd7dc6042c30518ecad03c5dd6f07031ea670e0a7f76f32303
font_02_sfnt_off00018400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18400 10812 bytes
SHA-256: 83c190d6194042331a006659f17b32348cafeb3b24435b3a57ea1c4827ce94c6

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