Malicious PDF — malware analysis report

Static analysis result for SHA-256 32db7a471ffdc16b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 15:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a64a81ac344476e64363d695da0cca3 SHA-1: c0341c0f66a90c808ae1bcbbf92c066adcf66bac SHA-256: 32db7a471ffdc16b82fe71e121c6093af593eba8afbf804a53baa6201e0270a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://giaodantanthaison.com/Images_upload/files/bukubozozim.pdf
    • http://congseng.com/uploadfile/files/47054636112.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/bimasovelu.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc43798b65742f1ade8c1927f78df2dd/75703420150.pdf
    • http://serenetour.com/image/upload/File/darujejozibojulafo.pdf
    • http://chi-kara.net/Upload/files/22526025218.pdf
    • http://daisytalavera.com/userfiles/files/2699392708.pdf
    • http://superfasttv.com/uploads/files/17242628237.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ka2jfla1gs8m8j8uhjckn2dtc5/39832556302.pdf
    • http://jenan.com/ckfinder/userfiles/files/33109688620.pdf
    • http://bowlingkillers.com/imgdb/files/mujikojokotam.pdf
    • https://tepatsasaran.com/contents/files/dubobibozexutitiri.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bv7ldgm60i40va5ademfoj9kov/volozoxijalaxeta.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b02i04nhtpv92snqshrcaapon8/23148267111.pdf
    • http://fonnepal.org/userfiles/file/vasomipanupizolibu.pdf
    • https://zzwgjx.com/d/files/kopulugixujena.pdf
    • http://thankschicken.com/uploads/files/42245880510.pdf
    • http://thaifilmind.com/UserFiles/file/51531573630.pdf
    • http://besttailor.info/ckfinder/userfiles/files/fipavapolagigebolow.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b4c876a890fc9e19797c5249868e4c89/69060283433.pdf
    • http://tehla.eu/userfiles/file/33186228242.pdf
    • https://pnp-studio.com/fckeditorfiles/file/tegimasagafi.pdf
    • http://fruitvita.com/files/files/jebudisak.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/ninubixarosesusorajuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=descendants+full+movie+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 16792 bytes
font_01_sfnt_off0000cbc5.bin
1d8419bc76074a718d7c9089dc83f0a2ec663c3c844f7232f08111e171130420
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 17800 bytes
font_02_sfnt_off0000f94b.bin
f61dbab14cb2222d75ba39ceeda05bf41a6954bff2e80859dde211b69d3bc520
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 11048 bytes