Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38e6af347d60f81…

MALICIOUS

PDF

84.1 KB Created: 2021-08-21 13:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c531329bc6ef63f583084f7cfae8eeef SHA-1: cae698c4e4d204e638cec23e5c7b899525b4bf03 SHA-256: d38e6af347d60f8128efa86147fbf045806a6bc064601b76d330fadff7a2f5e3
164 Risk Score

Malware Insights

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

The file was detected as a malicious phishing trojan by ClamAV and an ML classifier. It contains numerous links to external PDFs, some of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The presence of a 'download' button lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://crosswaysrecruitment.com/userfiles/file/67219649579.pdf In PDF document text
    • http://cl-pub.com/files/files/mutiwepapetozexexuvi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/57266978677.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ed54aa5b---31236014170.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/81732965943.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/74654724854.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/luwivozoxonugudut.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/nejorovanupikularagejiso.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ptfals4qpa0ivd0fpij3h506mc/woweto.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d5646aba---75742667415.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea28e393b2---zuvalokexujupadowu.pdfIn PDF document text
    • https://equinox-e.com/upload/files/62159824444.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/1hkqe4qtcuvt3djpcqbr281e7m/1643314555.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753563d3406---86871688337.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/livovibimomunufelifufuji.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/171830321568.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/sezikuteme.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c8ba98029---relilojuzewuzojawijupameb.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/54438206149.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f1f7a38f5cb69cd97e6c63203637e9d9/pojudusawezudo.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/fekexirazaxidedulabozutem.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b37b01e6---25778581952.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/solirisulegodonenozafez.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/edd4ce86d1dc376590b4cbd963d6bbed/16146728697.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zokodosotineta.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/nunijudupamisinavosoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=carol+alexander+market+risk+analysis+volume+4+pdfPDF 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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 11244 bytes
SHA-256: 2db8614bde5b2f75f30b50662c5e2c05e9442f3e9e4374beac3923c580f297a2
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 17028 bytes
SHA-256: a7c4174aa4d39c5e49bcba41193bf936700cf6b0b1f0f6308e3993f2a58dd071

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