Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8b768d3ed4fd08…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 19:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 275a8c62122f5c82b3b602a2be25225b SHA-1: b46ceccfcfa550c6c336e2aea5b6ad6e0d020f18 SHA-256: fa8b768d3ed4fd086025ec2da08c586cfcbf8a9c292e79b181f4a47bf11db339
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing attack, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bielle-srl.com/userfiles/files/72589784373.pdf In PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/93306571850.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909213237.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/rabisepelerit.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/weborajisijejudejadagino.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15d0de86043f7453f5c9c0c452e6bd2d/vuxelomewete.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/4515939496.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/10085857983.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/dopul.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/zuvewozedejubud.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac77feeeac---50402982365.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/19491531361.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/51259872322.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pilurupinesijugaxusizewi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/u8fgogmjldiokt0ju079vivkeo/85948328597.pdfIn PDF document text
    • https://isleo.com/i_photos/file/63398234996.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/gemumekesigoxigopajota.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/butasalipurazizuwarexabi.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/78648929187.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/79095942357.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/23445169315.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/bolimezotizatuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=drift+racing+2+cheatsPDF 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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 10568 bytes
SHA-256: 8cdc1bc0036b00ebb388e6d84104342e8ea1f4c2f59978333d427197406acf8d
font_01_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 18172 bytes
SHA-256: 937a0516e57d7e71327c7b052a0a1187726d7a7a1b6b4b20e76b78b424ce251c

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