Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c256c521a85aeda…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 05:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c4dc5458206e5be6af611069810978e SHA-1: 96afd17dc31435783c07b960e03fcd948362da8c SHA-256: 7c256c521a85aeda55f98a2813e8c87dda77b185ec082a6b64cdef54e85e7ec6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://przedszkolenisko.pl/userfiles/file/31061211481.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/659e82e4494a8ae7f1cb3236274840d5/lunegof.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/wigasufagaluvewute.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2165d8cac7ca6d48d59190d8f0c496ec/1952791504.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rawim.pdfIn PDF document text
    • http://houselandia.ru/files/vasuwawijuxawamewogo.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/54060187197.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c79860b84---davaluzelafefej.pdfIn PDF document text
    • https://euro-commerce.bg/files/28122988715.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rroejlo0t8m0d4lp3mgtbh2mt7/jenidejetirosol.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4300a8bb7ba5cff489cd80901968bbdb/37093721874.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/85716229157.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/46237336150.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32d232e005---13481964980.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/85824224469.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108139bb44df---14880801763.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/muwekaronexusekaf.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/46279657544.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7e690106---42414974824.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630210127.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7fc6f2a0c---64078283597.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/45973068986.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/99567400696.pdfIn PDF document text
    • https://rippa.pt/files/file/boribikajidasel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=another+word+for+reliesPDF 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_off0000bb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB73 16100 bytes
SHA-256: 9eccbb1bf652a416f7dfbde0b2d6b8b588dd9e2109090ef0941c0fc734182f01
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 10356 bytes
SHA-256: eb7f310c3c18ec76ddee4770780050f679119d247513f83e4edaf620358e47cd
font_02_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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