Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cc415a97f45ece…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 09:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcc6ad9b682922ffe57525790bd1377d SHA-1: dec64c77e5f32d0e088daca45b996de5d5f755f3 SHA-256: d6cc415a97f45ece89fa1594cbcd7cd722c9f58fd5ba7bb3f684ebc01841b254
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in one URL and the ML classifier's high confidence score further support its malicious nature. The document body is heavily obfuscated, but the heuristics strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://infrive.ru/uplcv?utm_term=sat+past+questions+and+answers+pdf+download PDF link annotation
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/28247361448.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/xupodabibokotefa.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/bizefakudodebusazobajifu.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/63175736366.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/nozosejezafefurerup.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/72297143893.pdfIn PDF document text
    • http://schubert-hh.de/image/file/69326954540.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/detokagutejimuwemigo.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/kemob.pdfIn PDF document text
    • http://entrackintl.com/uploads/pujagezaguwuf.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/77890057184.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/wumowamesabumof.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210916185202.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/lokivev.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/nisamosasatekapewugus.pdfIn PDF document text
    • https://motoralbini.it/files/file/57538110925.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rivimalopodoro.pdfPDF link annotation
    • http://ifaistos.reality.gr/~triantaf/images/file/jijanazogirot.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0f7df6e776bf555553bf4cc967d705a8/27905345476.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/povebugedu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614728933e11d---83863333934.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca9a4d334---wikepiguwubi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 17872 bytes
SHA-256: c0882178377946c59d8e528238a5c223c35b85a55b25a55517e951c7db5a2e49
font_01_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 10900 bytes
SHA-256: ebc5f82ec5d9df579903339b3f630e77b65d9e84cdc0e8f53a711117b80a9977
font_02_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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