Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a38d1a1e36bd6d…

MALICIOUS

PDF

86.0 KB Created: 2021-08-26 10:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bcebe71101bed90235b3bd643376aa2d SHA-1: aa0d91280d8e684c11cbd1b63e283d81b34c320d SHA-256: d2a38d1a1e36bd6df9cb9bbc97dd62fe945e5e47cc77d8cd472cb4053a5b70d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://infrive.ru/uplcv?utm_term=how+can+i+unroot+my+rooted+phone PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f671d62a---rijubisuzifuwipewog.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/vilef.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/sulakenujegipotavi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nejib6j8v89gpkpqvmpbskfujb/kidelakoxinez.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/914adf698987d624b2dc293a2fdbdd35/17605480426.pdfIn PDF document text
    • http://hkacca.com/userfiles/sefivob.pdfIn PDF document text
    • https://seikico.net/img-tym/files/29828481909.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o6io97qtjcopt3t8q7u9uhjsp1/pepowepobum.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e72b7f8a3---darolupifulewevimuligu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3bb65a4d7258d04caee92192ff2df22f/53219491364.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/mugusa.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76525116025.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/247a2b9a76f462332e5478b6559d1b56/jasivezewabavig.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/jabukuk.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6524251971f146c0a54d6109bdfef01e/mesimipidezokasivisupedur.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/pt21h0bqi8tj6cv53d2sqs2i8h/88754997426.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kavoxinizazaguzenavu.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/33655552366.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/89592106909.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a781f0c17c3---vefobowagebinofunusa.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/69212774885.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4k94h4igfsk38j9d7e1pdkjgng/51007584941.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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 16652 bytes
SHA-256: 8c2bdb66651df0efe9d48da63ffb99eb117e76545c5189c0374726e7d5a41f23
font_02_sfnt_off00013000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 10856 bytes
SHA-256: 70039adeda5de0c2b83ddfe21f4f4eace8e2c8c32bc27eded29c285a3045f6f2

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