Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a21b0707915b353…

MALICIOUS

PDF

95.6 KB Created: 2021-06-29 19:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1f920b9d880606b33c484b535ccb934 SHA-1: ac37ff633e7ba732d6afc33e96bdebc6f54f1128 SHA-256: 5a21b0707915b353dfe48abc92bd32cb912c5dd9321f825f65bfd71a92758b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aedb4d5---79674683724.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8723bcc3cda6c222176c4e2b55e26026/99532161789.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/82569dbaec4eee8aeca1f7269f08abc2/wexedisudobopalakude.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/39524147747.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qiuudhm7d525ehfb4gftgf4jhp/30384508120.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0468672d5caa4301d060cb9b1f6d22a2/rulipetewelawijakamajepov.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/542a0d1cc1da296c952be1b2558061fc/30932183055.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/885f649e6c3f297933e81ce721d3f825/91354205118.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622939748462959547.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6c0005d4c---97963797849.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cce19369b8---26801216762.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dacef5d0---97888083130.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/64827451746.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53754407388.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5c2a6e39000f016b18d1c002876bb5dc/16291615515.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062904472793.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0fa79e8e6de82c4f0700d52932d5c47/zumesif.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae94776204---burawobitipusifukaditoxa.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/59186402882.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c69fd761b0141fb38d835db8119d3e2b/punikug.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/58349586834.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/molixogedez.pdfIn PDF document text
    • https://t2sc.me/userfiles/fobidugamujixelugikititu.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16216883221249.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/2079858088.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/57728133003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+good+research+paperPDF link annotation
    • 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_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 16768 bytes
SHA-256: f860c4b5af80a149d74e5a7c28b318f7605189debacd7222dfb72e762f84c8c6
font_01_sfnt_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15675 10932 bytes
SHA-256: cf9ec4c08d9d4a5d8c7cd74e6c2a3f18f2e8c6c69ebcfc6502879fd019a04974