Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c912cf69ef3a494…

MALICIOUS

PDF

86.2 KB Created: 2021-07-14 10:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20a98221a632140477696a69bbe66cd9 SHA-1: 382c4a20b81f1ff622dd13faec4503ce34e99587 SHA-256: 4c912cf69ef3a494d3d3087856c91905fe11bf5b0170e506d661a1049f799e46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it's part of a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4832

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://krisoc.ru/uplcv?utm_term=area+of+parallelogram+cross+product PDF link annotation
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e12735699---siwowilisevazotojax.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5101cb023---37005577808.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c522ed0321---7868662034.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/24944049405.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6id75vdspp42m9m8dc5bl3aivs/jevoxutidutiwovo.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/selavizonomezapop.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfd4bcaebd---71623310526.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c918d293e---gemazipisage.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/eaeolv45hiqm58q8un9r4jfe0n/17619894082.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/icu80r79ln4j9vo5s09lchbac4/wosaralejosomerokomujuk.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/211abdd41a400327f9c05bb5adf716ff/nipefesuxuxeniz.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607217db13600---83561428890.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608250addffcc---rusutanegerimufidunewibe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/menid.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bed13c07892---dejize.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb1027dc7---87312177019.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d243bb5217a---57765660161.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/wasakoxijuvonilipa.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b6309027650a195b55767123c1049b0c/62941416760.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a690bbb0de---komopugefaxunofikexipeg.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607831ce7a27b---gibetinisusobejikal.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/65821097261.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10848 bytes
SHA-256: 0a32cb5679bee37ae6f6d03023b7322e97b2ad42998cf00c8058f57f1314cb4f
font_01_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 17784 bytes
SHA-256: 4c691a19940a670055c9c1565ce2bfd82ad41d14bd37ec630770cd5af340cd86

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