Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f36c8aefa104701…

MALICIOUS

PDF

90.8 KB Created: 2021-09-01 07:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1563afc6418c706d6e7832e898949547 SHA-1: 600326c1e043bcafee8ea647fde8cff926b510f3 SHA-256: 3f36c8aefa104701c1418440b4a1b0bcdf612f51f2122dfbc71df60b904d64a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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 http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/83885760310.pdf In PDF document text
    • https://fwullong.com/upfiles/editor/files/72801457852.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/o0r7kk5uj85cpa9hhln7gqolco/savezedififi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c6266280d40---noxaginiwulagerata.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a76b208c04ed03206805fc269e662bc6/fanepavemeletitom.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/96281158422.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/kaxipodoxomokomoxupapaja.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b17e7ea45---18279498646.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/26048047368.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///61062701481.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/5r91kj62vrh1qn5lhqrtsvh4q2/65897883488.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/52792127687.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/6449549760.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03f592c2c---zabikumupotasirogedadu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77a1571ec---bekuwozewaxepujek.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/75815382173.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/relowatirupuza.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/71011570946.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/53911775022.pdfIn PDF document text
    • http://yuha.be/_files/file/11189983512.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/76756542466.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/mifabuzokujetow.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5a296e1f6757bbf02bfc4b8f3672e3cd/26889404429.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/21967096952.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/2591890085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+story+of+an+hour+literary+criticismPDF 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_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 10780 bytes
SHA-256: 9ee13c6a3ea1853ccd05db5c1df16b3c266a495e380916f01204c41be9e03925
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 20960 bytes
SHA-256: e2daa68f2709b0319209a411a9fd8368102fac92e303db7907228a9271ea8fc8

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