Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5146f98c2f97fa…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 03:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd0a0b65c18ccf5934f8b15893cf08ee SHA-1: fa54efdf14cd278bfd3d5af3988a8600ed03af6d SHA-256: db5146f98c2f97fa9bf5fafafe882b4af23fad222198a81321efe2c5f23f8fec
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass security filters. The embedded URLs and link farm heuristics suggest the document is part of a phishing or malware distribution campaign, likely attempting to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=what+to+do+if+you+forgot+your+android+password PDF link annotation
    • http://zeci.nl/im/image/49897314552.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/8598399253.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/xugubebit.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1adcb012ab6b2722e9b968db7d4f9ade/jerowevod.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/90176655934.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/58638961735.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/45818585181.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/37917660908.pdfIn PDF document text
    • http://rafaelokazakov.com/file/rajigojabalizuviki.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/gelapivilunevizavafe.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/guzavek.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/sewabude.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51b358ba5fea27942134e13dc1f881f6/rivawadugiga.pdfIn PDF document text
    • http://schokofontaenen.de/idata/dekibewuledawubix.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/18319838029.pdfIn PDF document text
    • http://elitacasa.it/images/file/11026259577.pdfIn PDF document text
    • http://sarna-zapiekanki.pl/ckfinder/userfiles/files/25031209986.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e20640bf0a6c1bde6614469e01fec7fc/furubowivugefefolewaxegag.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/82821049960.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/46255429522.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/puzogow.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/zelufonesabuzabijazevu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tekabotorivu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0a0b4c41---66252810829.pdfIn PDF document text
    • http://519pf.com/userfiles/files/kobogomezavuduk.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_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 10892 bytes
SHA-256: 05999d9a72746c2008fc3157307698ea14732871a166b7574d103ac0dfad16b0
font_02_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 17600 bytes
SHA-256: bba5363b98fa91e76cdb6d5ea019c692bc4836047f1de483553514a24aa91bf8

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