Malicious PDF — malware analysis report

Static analysis result for SHA-256 803aa66e548bcd41…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 00:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74008c2557e4b0d9d5dbf90e875ee94e SHA-1: b35dc193d2e03d7aa9f44e40f4f0d8c53319be04 SHA-256: 803aa66e548bcd41b839724300374616f1622a0a92dc47dfc651b848e2734ffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous links pointing to potentially compromised WordPress sites suggests an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/67a986592fbdf5d4b50341efdcbffae2/73219642577.pdf In PDF document text
    • http://farmina.ru/uploads/files/fafomaleminulegor.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zepukulavuxasotaso.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tu8rjrc6dcfd7tqhomqgs6io4q/25102243489.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/zeximefajil.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b3681855---68196114005.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b309b5d38---xerumerijib.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/67m2n2qkkfjcvmlnibculmsa0t/xidamavoladijemazi.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/81880792886.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/xitogido.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/lumovemogalajo.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/32357257720.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b8b1331410a25c1823828360b074da99/xidopimuzi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f230e8c36baf66e9c13f4a0e85fd2387/43012044929.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/43038201777.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e2b12362b3798a5897349a549cf474ea/9336980884.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/70115679105.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/40d7fbae1740b30ea0f7287ae6a334f0/98720488510.pdfIn PDF document text
    • https://arendic.cl/files/44424399404.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b9c85e038a5d0319ad42eb02d695b473/58190269234.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lixolonisarikolupij.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/rodipeso.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5cbiaitg15ml3sq9dj84igt2ao/64203841580.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/52380948996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=2014+chevy+impala+manual+bookPDF 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_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 11060 bytes
SHA-256: af319b1612179b1a5dcac2dc0d35757dc4781cd72e2326c4c606329ced9dcfa1
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16576 bytes
SHA-256: 5d0bce3d374916beb46de870294a085d4707b678fd9bacaa223ff48848f8763b

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