Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15bb36bf03e80bb…

MALICIOUS

PDF

82.4 KB Created: 2021-08-29 11:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98fac73682d14265bea69634321ec716 SHA-1: 4f76a80e9a318c00ad9e42be24b4543daf82cd14 SHA-256: a15bb36bf03e80bb29f5e26b4fff6ace9e3d0f0078f2b2e6f184e7672f71953f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host and distribute malicious payloads. The presence of multiple external URIs and a link farm structure suggests an attempt to obfuscate the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=download+iso+ps3+games PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f68b0129---kadizexadirezozawiwikuza.pdfIn PDF document text
    • http://effektfilm.de/files/file/zebenusuzumox.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/kafexidexonudevafomunagi.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/14287161224.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v3upq363gloc1m5ms7h18e2ipt/nesonuwibenibidoper.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075e24db8799---72207714372.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/26938008982.pdfIn PDF document text
    • http://ahchala.com/img/file/mifazugumidomibap.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b498b9f9---sinakuj.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160872f681f978---7005908029.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/98947949481.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/kulez.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/3kaet1rk4jaak79p5evdind007/waxutesimor.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f042141eb19---27364907560.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/litegabujiverivuxozar.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/lawonuvakofibumibel.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/97364801574.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tndjb2h1hh3d1qi1o63f8oiha4/dezeku.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071806460834.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/melamalek.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/536f217647633e124b5fbdab801a100b/666111681.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f1f969d4f1e66b962c700f215ba46b4/xukevumunov.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e79874f7---xerudogemovusideliriz.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160739871b77f0---sinafon.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/171440955.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5gmmp3t991ranvr5eqdpqidrk3/teperomomigusemejejujore.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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 10796 bytes
SHA-256: e1e1ee69a64e159ce31bbe195ccd655c19d045740c7004be066c1c8906fe193c
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 18356 bytes
SHA-256: 50303e09a7de1864b63a542244b1f1c1c9b92e6d558e00c8c227d66b894b4306
font_02_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1