Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d839b063635b95…

MALICIOUS

PDF

80.5 KB Created: 2021-08-01 23:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84133043338521aa85a6f39393ea09f9 SHA-1: d04f6cab99ed1b2e86347c7ac1a5c7d0012e2e1a SHA-256: 49d839b063635b9515402c9c2d31a67862c6babce9f70158f55eae6eea9cdf30
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a large number of external links, many of which point to compromised websites or domains associated with link farms, suggesting an intent to lure users to malicious content. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=ford+fmea+handbook+4.2 PDF link annotation
    • https://www.ojchamber.com/ckfinder/userfiles/files/lupozudojibinepa.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kazomesugibaxuwuwigewiza.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/xabukekupajorolikukoxiz.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/juxokewopubojokuver.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be469d9d1---gufuko.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56247337818.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/29698757034.pdfIn PDF document text
    • http://merwepizza.com/upload/file/tepupigezemotedovimenovef.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/18969918474.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/192374dcffc67a7e7ba09e14724636eb/70743619952.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b772419a13---83066490384.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o5nc89lj2of9svb8jatmofkbil/1730903246.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0jtmveoob3fhk8um7ee7j4sc0s/66778632152.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b34dfaa6a7d357fe0fe7e29a2f555d82/zajovibugorafedupenejire.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/zidaki.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/93475631856.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf302f0d9a---34798228588.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/50907950140.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b133c30ed9---94593987224.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210629041041.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/361500kf1mcjd6btsm3aiitnj5/nojaxupexidiguwo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/61649290218.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c4bae3c0a22819f978fe1171c62fea52/situwebesemubima.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c24f2ef146---39519363197.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/oquprsvn396gtl1tcnremdi9tq/ragabudiluguxiwolawekize.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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 10688 bytes
SHA-256: e24892669be071d741e4335eb309e0f617341f70dc26b9c29a4ca33b598ec08c
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 17084 bytes
SHA-256: 5713c930f5af5da0073d297f386efb8f49bc5f88fbcad0c855140a14144321b0
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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