Malicious PDF — malware analysis report

Static analysis result for SHA-256 3553fa0d9437815f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 08:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a15ac6a901b3d03b944019796e2996b6 SHA-1: 29864298e2f47b125b6f6dd7c7791915ae2a437b SHA-256: 3553fa0d9437815fd6c154da6d6fff7f76098720987f8de24cb3cf0a9ae6260f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=graphing+rational+numbers+on+a+number+line+worksheet+pdf PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/dadh04bdc07d13ad5m9us6o0lc/digidanarobeburugabefu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/zujal.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/b0kqo39rirbgvu1ost07rrpqb9/dotizobolemexibumaguwip.pdfIn PDF document text
    • http://qdjshg.com/files/file/feliboxuvekudemo.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/kezinejifima.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/efs1p5uugn3h6a6dv0a8ehlphe/puxokeximuluninepedijowo.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/bonunelenigi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/428d886f82d6a88cb7d04c85aefad091/kokajafadopudalin.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9ca1c221d5e4ddbc1c7c05563122239e/51631690526.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/91991132627.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/86579976197.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/d8d4233501996b65d6f31e33229fc0ef/fulavegul.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613504d1bbf96---13352976869.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8e69a94f4---bazosikanobesuzobafiza.pdfIn PDF document text
    • https://temahr.hr/files/90901697531.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/698f1dc2e08850e803d1ed5bb4832a17/42966941057.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vozuditefega.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2f022b1deeb44b6bc0cff32fc1e824e2/zilevojijawogajivej.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/birugedidumoxajozorajim.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/30136011925.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/b777e7e57fb5a52c94de515174023689/dosilimexogofovuwige.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/529275d4cabc2352ebc7053272204bb3/wajafazoxevisir.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/bagaxeferolajoxawo.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vemepekobofimiwav.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75084abe8b---nubejojolofubibat.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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 18240 bytes
SHA-256: 4a1b6612902daef34866b02b702fe5aff37b75a0c8d19df4a6ba17e6ef62b3e8
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 11404 bytes
SHA-256: 6a7a2930717ecedfe77f8a7f6d1eab4cf9cc0657143dee5b0128590b0c6278fb

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