Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b7530564cdf004…

MALICIOUS

PDF

88.2 KB Created: 2021-09-11 04:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52ddf843bbc58273f96e931a5a716bca SHA-1: ff603533944b3369c97556482ce427296c065fd7 SHA-256: 63b7530564cdf0041c209df3ff99d7eab0a17496ede0b2310f6e2abd2ac16b67
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the interpretation that the document is designed to trick users into downloading a payload. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inimtrento.it/userfiles/files/38850344321.pdf In PDF document text
    • https://pensionradvanice.cz/res/file/lekurupu.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/36763027013.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/3171228007.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/27848007533.pdfIn PDF document text
    • http://poultech.net/d/files/gunedajidazagidaberezaw.pdfIn PDF document text
    • http://coolscape.info/images/files/4530922432.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161335ddcec6a9---ribimirunosavoponulu.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/rixezevuvuxeneto.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516a116e4a---jimujejatixomefumexizojub.pdfIn PDF document text
    • https://greenways.at/userfiles/file/61423933646.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/76760365930.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/lomedowabusotiwibadidim.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109051808571735.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/duvalumizinetebib.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddd36f811---37523351420.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/50293038927.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/62911345673.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/nagefaxigegagevapufow.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/14114643407.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/zezudufememuxo.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907105050.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/86886667973.pdfIn PDF document text
    • http://mayjack.com/upload/files/10920661979.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/pepimaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=makhadzi+new+song+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 17016 bytes
SHA-256: 71ce08b4f4ded977f63725aa1c5bc51b0aef62ff6d6a7c4b49f9355bf9828b68
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 10756 bytes
SHA-256: 4dd78a78f10d1e566296786903fb546e219969e112df7184eb1658679b153f41
font_02_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 19144 bytes
SHA-256: d3c6a30f1129f563aca5f0363a8b48a415fc07216d059ea590abdb47c63ad106
font_03_sfnt_off00013ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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