Malicious PDF — malware analysis report

Static analysis result for SHA-256 072ad49cb86bf071…

MALICIOUS

PDF

82.8 KB Created: 2021-06-28 03:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8528c7fa3e560f9427540980a9bf7521 SHA-1: a98cd492ab159e6192e0978b822f509124f32a08 SHA-256: 072ad49cb86bf07185346f8f2c5a786ce450f8b6c017cbd986dc8cc57f6e0c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7347104a1d700aabf4a2691b3ffbdeba/vujazepawedebonuf.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a615a6656e4---xonekobofidokibu.pdf
    • http://thankschicken.com/uploads/files/92194759287.pdf
    • http://camonetinternational.com/files/file/6527725587.pdf
    • https://clubesolbra.com/uploads/files/zudetukimuvexexuwosaka.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a147620e---lesogelujogibelopagakut.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/70862364635.pdf
    • http://the-bom.kr/upfile/files/82529144777.pdf
    • http://xahscw.com/userfiles/file/70155866773.pdf
    • https://datajournonepal.org/files/28960171218.pdf
    • http://stlukesmn.org/clients/17773/File/tonusefudedufuwubemabo.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b752eeed337---61137047008.pdf
    • http://amphorabeautyclub.com/campannas/file/10903157624.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/89488855538.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794c5a12e4e---novosiborif.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2aaa23a2---gosafamomamugevasa.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/bixozawelakodof.pdf
    • http://spc1991.com/ckfinder/userfiles/files/84204792107.pdf
    • http://deurenhanger.nl/userfiles/file/56507740909.pdf
    • http://n-production.com/upload/fckeditor/file/85116766402.pdf
    • https://amd-export.com/site/upload/file/2848009369.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc23005ac5---xajonowula.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/14740942026f96825846c8b58dad1e09/52484454495.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=convert+500+mm+to+cm
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de82.bin
386ee550310b4c004dbfd22ef0418c310b3f19d5cb81f137cb34da69aa9afd64
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 10276 bytes
font_01_sfnt_off0000f5b5.bin
6e272409bef2b804b1b8290b67e4579f51277a12cc15c0cc7d151bd413d16a6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 18176 bytes
font_02_sfnt_off000124a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 16792 bytes