Malicious PDF — malware analysis report

Static analysis result for SHA-256 16786fad2f9e0707…

MALICIOUS

PDF

88.8 KB Created: 2021-07-21 01:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c92577549f44670f2ffe4c6980dcd80 SHA-1: 11d77b4b3988cfa398f1ca48f0b1e76ea9276365 SHA-256: 16786fad2f9e070795067e5b00c6ebd3a9740f6cc5cc8458cd6caab8b6f7fe36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. The presence of link farms on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ep89bhu0q6a3kqait48b3p6ti1/jogiwa.pdf In PDF document text
    • https://gegeny.hu/uploads/file/tewarukifexomumexazikis.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/pamef.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/wiwaros.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2b8662bc9c3884094ece8c96e5be6e29/77517719038.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d07dc60380b8bb6b88762874489edbfa/turuxubit.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bf901148ba0fa29fe2678f29709895a2/wulojidaxidowubava.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/090132417070.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b09cf138a99---82053897821.pdfIn PDF document text
    • https://actor-conseil.com/files/file/40398957353.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084792e78f46---susuweworosotepid.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/47696429952.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/46781277426.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8c7e9ca7087652fab904fc0b13dbb515/bigutodegojowesaju.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lgb1kagg7pb3iut100q7qp5ogq/saxob.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215311616246223.pdfIn PDF document text
    • http://meskerjager.nl/media/files/22543584790.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/87dab18c1e68746059a0686863e0b777/7949519530.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tuzolimodusag.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e2916d76cc1f94663833fcee8030ad7e/xejibowix.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f2d46ac4219b6613198ebe92ba2db6c7/69719792139.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa16ec34a---35672810079.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xuxizorudaliwipu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb7ce78fb---18897383398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=concept+of+physical+education+pptPDF 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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 17640 bytes
SHA-256: 628a40f48b5b20b88af7f25b7b4b6bffc9739087c0eb1b617cbaf8ec4185104e
font_01_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10864 bytes
SHA-256: 7b2010a9527cb51674b5c0bb911b9f8e3fe8775f77db64b3f6678c4be5307488
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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