Malicious PDF — malware analysis report

Static analysis result for SHA-256 612279e708007f59…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 13:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27382aad99b1eb6c02855e19dc7d2e4f SHA-1: 25d8b00dad25654ed75679b722e1ef4a0a390477 SHA-256: 612279e708007f590330bfd9b60b8346072841e735a73059ebb6c97458bbe193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=word+mac+export+pdf+with+links PDF link annotation
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5bfaee0b8c757001b6ed9515f3132a58/dibezejafiruk.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sqqfaq9lqafstrecm1b51sp284/gusirevenukixo.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/78598151452.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/951c2308fb99ecc8b08730aec92af282/zegirubowaputoga.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/38583019124.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7b254b71b---94873999372.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/49885625230.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pmjnlsnrkhkho86vgrbcoe54fi/xafomit.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/8746080339.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1216ddf00f---duxamibipuwibirab.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/99101094196.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b66cf09ce14---57814570170.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/v9856fq1ng0vj5caogbjif3i9d/mewepufun.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/luwereraguzefatetakifivo.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/wolenitufexikijesot.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/37025798088.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/ripolamog.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/19992103990.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/redutikelefapufopitozudex.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879cc5aeb53---31608320455.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dp7ajoqhdoqvspgf72phhao997/59976255858.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/072d3063c692f7820220c592eaf49800/jajosu.pdfIn PDF document text
    • http://nfc.soo.jp/file/30330112687.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/dupagibus.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/62438815619.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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 18348 bytes
SHA-256: 1057a7558bc16bce1d0dd924caba10f78406d401928fb0ae1ef078125b082082
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 11156 bytes
SHA-256: 1a0e1d51011f9c81c6b4dcec66e1b49a71084b0bc917e7d23cf415c2de40d19d

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