Malicious PDF — malware analysis report

Static analysis result for SHA-256 501bba423dc873cb…

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 21:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a9559aab56a7949a26a1512207496a71 SHA-1: 4ede9f52a1717d1eff63931bd1fada4b3079a3a0 SHA-256: 501bba423dc873cbee53dd7c80de6ed082137db2e616a6ce43bc1d8872ef96bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document functions as a link farm, presenting numerous URLs hosted on potentially compromised or disposable domains, likely to obscure the true malicious destination. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM finding strongly suggest this is a tactic to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://agcslohian.com/userfiles/file/manumamiwujuzor.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/61d96a77a31b5081d8932a4ee4631875/rexuzozaxeripixakavinox.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cnukukjbecq4ov04i27n34t594/53877098045.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/povafepilelolevakorixo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/39aa0465620caa0235e3d90b1e87fd6f/78176815151.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-25/20210625204247112297.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/62692eb8b6050f887f93ba941310b8db/83561746105.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074967276d42---50843530371.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/getopotorilegew.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/pifobopagilixawa.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/km2to18d62or3nn372740d42v5/rimukol.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704ae9c868---sikusiwit.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7477940ef41ff16f6363866d13b8d5b9/76941718467.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/fikimevedurelojavutosuvob.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1889ad2dadab0061534d78c29c34b6fb/veviwojorolepukabis.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c99c14f3236e595de737feac5410b0da/gejolirogumotubenekadov.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ada4357e95e9ac9b681b2e3ac3a04651/26996858764.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qgituciirr66p8i8qqfu7osno0/gukuwurilowaledimu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d9bcf5a5---dirodigivej.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce9e39059---kalurile.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/42551688365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+flash+1990+castPDF 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_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10324 bytes
SHA-256: 744f49beef6c8c3d9248d52ceaeac473583b2d806650a0ef99552fb42fe741e3
font_01_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 17384 bytes
SHA-256: 2decb32b9603d8a27a5052de116e7bc3a8e2e272a034528a3cca65b3ad3f40d9
font_02_sfnt_off00014359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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