Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac6fdff8663d053…

MALICIOUS

PDF

89.7 KB Created: 2021-08-15 20:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 845b93cf77860b2fdc3093a2feb0014d SHA-1: bc9d3432c379168a3b8fccfe30ce7736bd41e48e SHA-256: cac6fdff8663d053c3be05147d3b1f58ec9e45b4712a1058ce86849aadad434e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV both strongly indicate this PDF is malicious, with ClamAV identifying it as a phishing trojan. Heuristics reveal it functions as a link farm, directing users to potentially compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://drrajanmahtani.com/userfiles/files/pigiwezuzitowikivexam.pdf In PDF document text
    • http://movitecnic.fr/ressource/site-image/files/59279245879.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vetetoziwenabutelivu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e94383fbb---80279466272.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8723bcc3cda6c222176c4e2b55e26026/99532161789.pdfIn PDF document text
    • http://citra.cl/userfiles/file/75005900503.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/javenebutero.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b3d3728d---ririrezomoviduta.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mb1dh0v1s8lkpfpejo6di73ubi/60586974254.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/93899658773.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/54952930004.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/boniluguwuz.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/73861597651.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/bb9ceb3172b75117fc6871a81064b888/10074139810.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9904c6e360---3660395177.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa780f080---41434934966.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nixusokemoda.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/34859913195.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/94322165610.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/74670546942.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/rijizowatevulirefarunozal.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///6461440743.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/59307747065.pdfIn PDF document text
    • http://www.chimix.comIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=exercices+corrig%C3%A9s+charge+et+d%C3%A9charge+d%27un+condensateur+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_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 11224 bytes
SHA-256: 921227410573279bad04051ac69919ebd551f273a1ef48f83fdc088f8c4a34e8
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 20228 bytes
SHA-256: 1522ef1bdf1b3e86a3fc9bdfe6a0650e6b54af3841faa926265468fb60ae6b35
font_02_sfnt_off00013d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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