Malicious PDF — malware analysis report

Static analysis result for SHA-256 647f1f1f10a53d84…

MALICIOUS

PDF

85.4 KB Created: 2021-10-26 06:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 66ee4a25a5e58a6ea0cf5915a0430cc6 SHA-1: 18676882a087c01064e91a4d022060add8cb0b81 SHA-256: 647f1f1f10a53d8418128a001f342a42996970812b2764a108a58a5a0d20638a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting a phishing or credential harvesting campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for distributing malicious content or redirecting users. No scripts were extracted, but the PDF structure itself is weaponized to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://wastran.ru/uplcv?utm_term=upstream+and+downstream+petroleum+industry PDF link annotation
    • https://asthasupermarket.com/userfiles/file/40967448674.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb344cf18---mewunawom.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/20659779260.pdfIn PDF document text
    • https://badrivishal.com/media/52630901746.pdfIn PDF document text
    • http://tipiland.net/upload/file/kufesikasim.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/26251176700.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/jekisuruwowitekokisilonig.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/wafagog.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b5b0ec223---52871868552.pdfIn PDF document text
    • http://mackits.eu/image/kezepox.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/32155442326.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/kasej.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/38935517347.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/234917007.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152d7a6e1629---88381975798.pdfIn PDF document text
    • https://maria-galland.ru/files/file/mupifapisato.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/71dafc922180007013c9940ef71fb6df/6510120786.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/bagaraj.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/71887675387.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/budiwuto.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/xogadirubigevubif.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/71362678202.pdfIn PDF document text
    • http://irths.com/upload_files/files/84284913884.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-10-17/20211017013122362229.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d49d4393df---8190835684.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/givovesuma.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160f6cdb6017---vekigazuxemapez.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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17752 bytes
SHA-256: 46813a93075d1094bdce3923bc4efd5b8d4555e1c77e0e4b22048c8731a8e044
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 10860 bytes
SHA-256: caae4c925e5b8f570d305c6858b93c3811613bf80f953939397762ba380c6ac8

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