Malicious PDF — malware analysis report

Static analysis result for SHA-256 f041864e2d9cf760…

MALICIOUS

PDF

87.0 KB Created: 2021-07-15 19:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c16f68b98aac44d0ee0d3d9459cbe3c2 SHA-1: 5cbae2b727429f78f4ac92df93f15688350d6626 SHA-256: f041864e2d9cf760a26c1babe62c3677e7fa53d0c0fbb650e1c2f40f5c243ef3
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=army+question+paper+gd PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160714116d0b53---jixafivabizadom.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2945bbfcd1---7449100928.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/wiluvima.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/dulolirelor.pdfIn PDF document text
    • http://epsilonsigorta.com/files/54560493226.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/wenitezefo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fb74660n4fprg22f5r5bc43d6l/mawujaro.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5d348753516c281457d23fb30347e5b4/dotesefeworukokanifakon.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdfe580273---kiwozovu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vq34e6j1r819aot20a56lib3s9/majabuveruvu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a254c85e---sefuzunepi.pdfIn PDF document text
    • http://dalaichau.com/files/wuwol.pdfIn PDF document text
    • http://chikatere.com/Upload/files/30093880128.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b281efa9b---jodazu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f632b605e04453d2454fdac4856c9796/gofomin.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec50a304f---30631977276.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8abcb405df---61214896662.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kabupexa.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/mp8t26gv2ofqbe544u5j2ufbf9n03ftm/rugiregola.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/muvefuwape.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c894c60fb0e---24406545437.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a9708ba9---63307048521.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/sivudekejiwimotoxudodidi.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/lezarosemowuvivamesenu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607419dca827b---zamepawuvidezad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 2276 bytes
SHA-256: 1b44c61baf9c7ebbde53e7eeaeec34c67aef6e7fcf4b71a0ebd8f7ed4de5677a
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 11032 bytes
SHA-256: b648d9be52a657716ca43bc4f7a651157f2e8f4455c9a3a6ca5d31eedebd9d9a
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 18332 bytes
SHA-256: d48b64b7f72e64a7b89aeb5414564bb7a556a5ac14402d9b7492852394e27ba3
font_03_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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