Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10e4783a1e8190c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 12:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6004b0ff3208d2c8831d6641f9a73fcf SHA-1: 647c9a4fa62ecaa81fca09fd6defa2a6d109620b SHA-256: e10e4783a1e8190c417dabf169863270c38ed7592e5b41980636e64ed46d28c3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback lure, prompting users to call a phone number for various urgent reasons. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious sites or initiate fraudulent phone calls, consistent with phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=android+uk+phone PDF link annotation
    • http://zhengfutz.com/v15/Upload/file/202196612274996.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/pozuzawadeja.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/93952842786.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/58765607257.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/mevowikak.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/raxinepikexujomore.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/63215432149.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210921_14E773C93A62C08D.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6f183d58---62633449954.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/52215660772.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/50465673001.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/38900327627.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/98681277454.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161307dd7064d4---pedojerorezewupawabekat.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/samijudarivuzijavafen.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/6811420336.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/xomop.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/64323954632.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/1519637842.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wemusigamujanitegiv.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/68043002518.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3f0e6037e972309803f8653bde2ce996/75824145352.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/94432134844.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/91809940761.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/nabupupowiwigeja.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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 18248 bytes
SHA-256: 473da50e6dd249b160ed8194526f1bc6cac58e1bec1890a8cf9f822568a70733
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10188 bytes
SHA-256: 08c58dda81eac7fe0d7d2b109b35577c4b8829fd681575ea9ca6ebb0cc58c60a
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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