Malicious PDF — malware analysis report

Static analysis result for SHA-256 3703d4b75325ea2e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-08 06:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b2e22ba14762c83167f1d50eca1ae31 SHA-1: adf8acf7b9732d76d8576b4a856eccdd170a91c4 SHA-256: 3703d4b75325ea2e52f6a8650d2cadce8b5a02888f444b120c7bdf7e7fc3e785
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates attempts to obscure the true destination or leverage disposable hosting for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=how+many+three+number+combinations+are+there PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754f111dd5a---fopuzazozobatax.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd239f158---talenagadavovuna.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/743df6544200b1000408bc8b7796a210/37793002216.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/50724781200.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/68910928049.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9182c64aa7ce87268174d86448bceedd/guvezewopebufe.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kmhmda4bsl9bmu37vun0g7nn01/dilututowapetejeponid.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe2be3280---44534381576.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22ab42f96---konakexukidevofidi.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924a0cfbd3---bominutonawidevuxan.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec87c6039---31623494259.pdfIn PDF document text
    • http://novichiha.ru/pic/file/koxenikejuduraduzopularo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160865a8115c55---88973006784.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac305286670---44667162172.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef49053a76---74223360929.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/28048073878.pdfIn PDF document text
    • https://avenue102.com/uploads/file/73724163736.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/32997748192.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/961bc29914ebd4208b3a7f38f64fdf43/83981916237.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/12552901330.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/pgq5a2fdnfha5i72bm2ahmureu/43579752182.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oqk2dnjp6cbon1o86m0lojtvke/wimewofetuzazikonegebagi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/40756430409.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/laveza.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04fc3b2a0---lorifipa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c8467850aad22ebaa44c5821a3058b19/47716228206.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_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 10880 bytes
SHA-256: a7b3a5cfe78b45d50ba32d590e4aa705967c0db120cf966151ca7afeb777aaf6
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16836 bytes
SHA-256: 7933dd105bc395c0a16ec602486faee7ffda351d5a120f30fcb789a1c4f17144

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