Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50a67e78d8b853e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 13:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 103e93c74d479462ff1ee20809346836 SHA-1: b18ef8242446ec631e9850dd1505d48bcbee519f SHA-256: b50a67e78d8b853e17d0382696ef0cc1abfb19bb7af1a49000a842435310cdc0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics and URLs suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=social+science+words+list+with+meaning PDF link annotation
    • http://currycornersugarland.com/admin/images/file/zajalerasoworimur.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/43032805521.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50fbcd2ac9---21522314375.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/3243709670.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210809_32B6B7FCB9932C5B.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/27355778825.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/52128313029.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/nogemiguxuduwa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/97dbba4e4a7db1c59e0b48d4d5c47c9f/87428959876.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210621153730.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1cc294a4e---rikuxibafaxesu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e47f6ac10e3---78627455519.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/e26cjko47fd2cluqg47mhkt1e4/dorenavu.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/60921937636.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/fesobogamekoxerokufoxe.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/memevigowuma.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/aaa8502bd2de00d0dcf4f054d537ae30/441947858.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/81327042644.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/gexanakevozobito.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/vegagotogalitomefojurat.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/pogoz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/625a9fa6959548bc490a6096f738790c/tafenadusi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac545fb1a39---mekizifusekisovomonedoxe.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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 10980 bytes
SHA-256: 32c8de8606f946752fe551308e6d8c4ea88a05f6ceeb03d606bf298ddf1af851
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 18520 bytes
SHA-256: d5c01fa74fbd13e4a485f6be058ebd00e93587da58ab00599488abce2c6bbae6
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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