Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff13bb7bf654901…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 16:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: db9d773bd531eee7d8d4b02f90bf7078 SHA-1: 9d61fa67adf0023a19b8c5e47ca8d602459697b6 SHA-256: 0ff13bb7bf6549010c019d415d151e7b65f5efe01cfe478433b30cf8e89532aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The sample's structure and URL patterns suggest it's designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a404552dece---pomot.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/00259d5fe76cc3e38ec458d91c76e14d/riduzononewali.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/rigarutumubipilebekosewig.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/dozekirawamixituwe.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c16bf55094b0fd8bb27148a4e385b9b1/91295146645.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4782520f0d4a9d42e598ada60efecdc5/13791124529.pdfIn PDF document text
    • https://bnovum.hu/downloads/24756823268.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e57696eec91da581b1941ec877317714/supesazolofirisowun.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2858fbe388---dukugamabobuduvemeba.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f460683ca52a540bb625d8d55f21047f/gulepe.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f0dae0e608f394dddfd460b4f6a48437/22610678794.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce4803564---bubiv.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/sidanunogosireloliwab.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3mml33aal36guuguuemcu3dqsd/gasaxaliva.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a303bd49690---tipusakunu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5a87a33cc19d43a9ab57a0125d8efb1b/polapojage.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/laxurowekijopi.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/bakapizonajifa.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/98sjelh4t5e442vve25vo3s9f0/jolixamegerux.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e39cf00d---26181268430.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086156a4a833---78769836924.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3a76348464d0d7a9d7d4a4e2e4330fa1/sujukadelelegiletezem.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/febofineker.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4bd270a734c1243566bde6a9a6783e4a/17985059992.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/24495466699.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a6311ffb---nobulavab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=online+ice+breaking+games+for+studentsPDF 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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 16240 bytes
SHA-256: aa17ebed68f47fa857e4bf39b6fff1b15e129c46890ae6b5896271e48aa0d0f4
font_02_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 11176 bytes
SHA-256: c8f63d9b1a04ee2cad82e5d640b83a1179d11e77a936f3c12002178e7c0f087a