Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f57658a88d07660…

MALICIOUS

PDF

106.5 KB Created: 2021-06-15 20:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 96e6c604fe536dc48abdeda1e84bd8b8 SHA-1: c23be23ad1bc73cdf20081bc7ca58b7bd58e55ba SHA-256: 6f57658a88d0766018443b7605b1707e8368e954f0473ca5eab82fa715eefabf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/uplcv?utm_term=wow+fire+mage+pvp+talents PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1d2d15fac08693057f31834a2fed3fc2/97637994586.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/060c1e066c51171b30ef0a0a78535992/ramolifevapimalat.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/28cbe9cc3ffac7bc677828169b65146d/2544924439.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/43437674123.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ccc11e8fa---gegevuvomusorufa.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0a7d1a80c3f6a01a8758ffa6609eb35b/wesepivod.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/nufawolemefuwonaberijomun.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/pn2h11kibnfuduvdu169iq8mg4/65272883426.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9b179061ee07ac9d49c9282756b3fb9f/89061524860.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f39196e821a741330790f8f944cb6923/luvenululokedosuwepavote.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609877bcd09f0---pomivesawejalutixugipu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160971475c4304---11333428822.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9e6c860ada4647aa7c74ad50e89580ff/72153718535.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/pirokituwamonu.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/4843345040.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/53545ed232a1ce5d56fea13d7fe5fb5e/58767413484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14354 5388 bytes
SHA-256: 7f1af54ff7d8e1bdb4c171de461941efcf3b309839c7366ca9e1d5f7c21e6fc2
font_01_sfnt_off000155a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A6 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00015e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E33 11768 bytes
SHA-256: 6efaaa08a2997a8925ad1c6a2e288f246edee91ae1cfbe1b89f5e181692f10e0
font_03_sfnt_off000186a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A9 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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