Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8826b7b2a07c84…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 19:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09901dd2ebb200a353a814afef7b11a8 SHA-1: 016c16b2adbb709465d33da6e539eb3032425579 SHA-256: 9d8826b7b2a07c849c63c13e472060e8ac029dbcbd21be04cc347a42b6de76af
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous compromised WordPress sites, suggesting it's used to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bularz-auto.pl/images/userfiles/file/rewudu.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b07176cdba43faae582fcfca094415fa/fegifudulosuj.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a828c1bc8---7191802431.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/39307901270.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf428dfece---81196971059.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/20a91df1451743ba68c9cf80b0da68ff/bojive.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbf948856---5408494099.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b8nikkqjef31frc8ols1d9f2eb/50518888213.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/27558719951.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec739e8305---jakasukejev.pdf
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/e29ebeacb2827f064ffa49a2a8744955/sezofefititatapemikilo.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b2ceefed---mubadalixuk.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565a8c194b---guzogegimexiwinotumegisu.pdf
    • http://obasekiestates.com/UserFiles/file/54778252343.pdf
    • https://alarouba.com/ckfinder/userfiles/files/loritovodevatigakiwibasel.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/363f3026b8617545321b9d53a12a6276/84282949711.pdf
    • https://fokusmedia.com/images/uploads/65601586820.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a638e13c6a5---kifadotofavanigalizuzagu.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/92eeea0cef93cb9ae4bd82ae50691f49/gubizonejewazizevor.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/cc6dc56fb204a7adebeab2c3efa4c0a9/dajomutexesujukatu.pdf
    • https://angelsstaff.com/uploads/file/5807188903.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73a89d4370---91183872506.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa902f8726e---82886947880.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lines+kidney+tubules+and+ducts+of+salivary+glands
    • 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_off0000ed79.bin
3948a1ff80dc90557bd988f6b8aced5517a00be823b10ee5380bfc7198fae910
pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 11120 bytes
font_01_sfnt_off0001075f.bin
0b1687d40922afdbc3fef868931f9e143afd2b99df1f3227c10034794dae3e16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 16692 bytes
font_02_sfnt_off000132ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes