Malicious PDF — malware analysis report

Static analysis result for SHA-256 f099ab729000b660…

MALICIOUS

PDF

87.2 KB Created: 2021-07-31 08:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 953f3ff6ec2c13876ef0071819f1a2b5 SHA-1: 32686390d00aff6aad041b3bae05ef16c43ea326 SHA-256: f099ab729000b6608c3d27b4b4f4a41299b0f7523d61aff1b34c962d961aaa6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and a callback lure suggests an attempt to trick the user into interacting with malicious content or services. No scripts were extracted, but the PDF structure itself contains links to potentially compromised sites and IP addresses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=how+to+view+text+messages+that+were+deleted PDF link annotation
    • http://doggystylzgrooming.com/admin/photos/file/pidigiwonapemo.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/jibosapifanugibuluwebigom.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lupemufumoraxarobopo.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/33558257617.pdfIn PDF document text
    • http://firegallery.ru/img/upload/zovowowineduj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0393572c3b092e0cd6dc22c3ce434caa/pavamegodimoporiberod.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/rufabinokuratizefo.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160768775066c9---laxepesarevunaju.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/26924526367.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/5271798000.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zezagetu.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/tebak.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/verade.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/41444297215.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/51132712345.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608701a4f4163---famitevax.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/kixod.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160754b2359111---kimowuzamumovubejekupiber.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/wuninokinilanudedarojuve.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fizemo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080543283371---sewudafugivepizavez.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/marolusunixapux.pdfPDF link annotation
    • http://marinapogon.pl/upload/file/90033114159.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0cbbd3463---27380886175.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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 10836 bytes
SHA-256: 718b495a15e348fd5c68af7ae4c0b0573dd600ac6df1091044c3a04b78effd36
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 17276 bytes
SHA-256: 017d2f143473a8b2f2b5902e5d987acd73642d85b22c27afe1b78f69ec677c12

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