Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a8595dd1bc154…

MALICIOUS

PDF

95.0 KB Created: 2021-07-01 20:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34f7d5cd7e16072b700b685eadcf3177 SHA-1: c94c07931557413b8cc0d8d6bfa8e9a3e4130e74 SHA-256: 172a8595dd1bc1547f86cd1817a03d18e538d3eeadc908fa97234abcc7361752
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 6

  • 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.
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0874756c5---25736841040.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d618d539314---fumidona.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092b28693308---61050373501.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/496c30a867ce7ea015a39c803789ce5b/12139953067.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8kamjhbfk4tq7jm7rghh766hh0/97006375951.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fde565f93---1468418511.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607349bcb8748---48617097620.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ca243d675bb07cb608396406504b8e07/tilalemumijarutus.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbef1adc772---dikefasaf.pdf
    • http://pwr-tech.ru/userfiles/file/96620724259.pdf
    • http://businessvaluationapp.com//fck_files/file/7488577445.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ff79e5b73---lefewujafolada.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cff4d8346---xevupirapopanakowexo.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/179976c94ae50aa5d0e1816fad27bc2d/95068551682.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46a0a3b31---jifisusiwewo.pdf
    • http://aeronautike.com/userfiles/file/wesekokebiliv.pdf
    • http://ankurgroups.com/userfiles/file/mufufopopetinasusuzeki.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/zabarokowadan.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2191521f8---wuvinelanuxor.pdf
    • http://szakkepzosiklos.hu/upload/file/lojadoso.pdf
    • http://aihyang.com/userfiles/file/rojojosi.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091599bd954f---21466492012.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/fuxisu.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/72241a2cab9f2810be088cd095e791c5/86916142617.pdf
    • https://lncl.org/ckfinder/userfiles/files/fojuzipog.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3adc372d4e97f3f92c0e92499c873680/mirisawozadenuses.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=find+two+integers+whose+sum+is+16+and+product+is+55
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f3.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 16252 bytes
font_01_sfnt_off00010acf.bin
9e4ccffeb8aac598cfe2ff42487f48393c538339f5f51fbf1184b202a297497e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 18096 bytes
font_02_sfnt_off00013ad0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD0 16792 bytes
font_03_sfnt_off000152e7.bin
3695fd08e5eccdaa33fd3c41755ea7fe9e4874f160d9f0750d71838a28acf8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152E7 11432 bytes

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