Malicious PDF — malware analysis report

Static analysis result for SHA-256 3591fa6312093b9a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 03:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7498af4da664b5307bbd70790ac84102 SHA-1: 37cbaa6841a0ff768ac6d6dd507bb83d00fb2653 SHA-256: 3591fa6312093b9a55bf6c289d746cdb2f08c656f118270d32abc5f63ab38af0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=dead+by+daylight+mobile+download+apk PDF link annotation
    • http://www.tecnobor.com/ckfinder/userfiles/files/begegomiwi.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/dufevelisepomem.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/93555887128.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/89463249399.pdfIn PDF document text
    • https://onecre.com/images/content/files/58837926097.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/jukafet.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613662996e0fe---6223564247.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d016794136---xugera.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/48680430551.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/jotafeboninalak.pdfIn PDF document text
    • https://ratosatu.com/contents/files/22950325558.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/889e2020ee1ff456b0434f6a2076ce06/winiwukegogapum.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/51394419972.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/46124997455.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/wamugo.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/64381302363.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64248081180.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/44628501823.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210906_004233.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/pinini.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/zumubo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c30b05694---21050555718.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 24232 bytes
SHA-256: 7998be0b71674b8dc8af4461d29ebd1aff98070a92742e371a6c90b35d55aea2
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 11004 bytes
SHA-256: d1a6a3e8a9efa15acca6a26721a374b18d6c1e274ced2df6853646d1f274af8e
font_03_sfnt_off00013955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13955 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8

Open this report in the interactive analyzer, or submit your own file for analysis.