Malicious PDF — malware analysis report

Static analysis result for SHA-256 1708e7fb5bd4caf7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 03:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 395ad650e7268e9382bae76bf0790bd3 SHA-1: 6090b1f7ea4726d7a80ce14b6e9abce4e7f2deaa SHA-256: 1708e7fb5bd4caf7f6059a19d8f2ee46a777488d065bea8c83de51179bc21333
176 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CALLBACK_LURE' heuristic suggests the document's purpose is to trick the user into calling a fraudulent phone number, consistent with tech-support scams or callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to exploit user trust for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://wietsevoermans.nl/ckfinder/userfiles/files/lebegisak.pdf In PDF document text
    • http://maslag.eu/userfiles/file/xaxok.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e09c6e19bd0---65452025836.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/fufolofifof.pdfIn PDF document text
    • http://186086.com/upload/files/13941498402.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23fc692ee00307099164def0c25578e5/63939939510.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/17531588263.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/14995972871.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s6i18jelbi94t3pmo3g18rgqsp/nekugun.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/rixolufekokibufot.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/kakaganonenadugir.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/72632224f3916a7dd0724fc885b8fcfe/wifolimubeso.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/82530894117.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/revuzelotiponawagabofo.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/42463485844.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/127d99dbab89623830f51fe45e5750dc/zubitoka.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdfab5847---tudemovasev.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/81414903225.pdfIn PDF document text
    • http://dnepropress.net/files/file/17557757284.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/pagobarobepawavujuwu.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/puvukamofipiwujusemom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manual+estufa+de+induccion+challengerPDF 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_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 10848 bytes
SHA-256: 56e16edb69d00339e1b6af22a002eb3b155bdb14d8b8f846dbfa3c6abdebec92
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 18900 bytes
SHA-256: 002cf6d654067191a6cf9d91792d7f995f2c8341cdad8c6eebc2fd77e43fce07

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