Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacd3af1db6709f6…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 06:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa63282de71f9290cf14c8ae9e74d9d2 SHA-1: 31d46d4039441ec48de62c1ee27219f0fcf47159 SHA-256: dacd3af1db6709f6526b297c3989396d4c337344465aac150782e2b3fe85500e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a tactic of using link farms on potentially compromised infrastructure to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://lctrading-gmbh.com/ckfinder/userfiles/files/8056567809.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/772a3f88947f1199dccdf8f3cd8371ab/jikukufixinotuborak.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/m4s5o3dmd5s6bge7ev5ac8q871/52408560074.pdf
    • http://adimhukuk.com/resimler/files/jofavipibawebodazisow.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb731e4d488---40320575368.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/clt9c88gch60ni4504uqd6n9m5/jolekelula.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/26034875465.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5hd4oub0ckklvtf7892l4rvoaa/kuleraforimuwuziruti.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bf416124d829e422678e82374af987c9/10701235465.pdf
    • https://renebeumer.nl/userfiles/file/torixadoruk.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949683aa15e---vepagixozizerizanebidiri.pdf
    • http://bukharasuwanee.com/sites/default/files/file/bafevogesanivotewalusazo.pdf
    • https://monyetjoget.com/contents//files/5408545169.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf852c52---padelewubu.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad9294a86---vesusiju.pdf
    • http://kirilmazbardak.com/userfiles/file/81957347078.pdf
    • http://bagiez.com/userfiles/file/48361989700.pdf
    • http://dinskayarealty.ru/media/file/17162924624.pdf
    • https://bluza-shop.ru/content/File/gamotorixafudit.pdf
    • https://goldenlinejsc.com/userfiles/file/jenuxunoduxadipederoxi.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ea7b00c39---koviliv.pdf
    • https://delcinfo.ru/img/files/files/61753694981.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c3014152b30b919eb05c33a96dc36ce4/21827435489.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=word+document+resume+cover+letter+template
    • 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_off0000f22f.bin
78bf5b725e45c403bc5477e2a3909be1b04c96cf08910d4ee6793eb3e38f28b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10740 bytes
font_01_sfnt_off00010af5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16792 bytes
font_02_sfnt_off00012307.bin
a47380b00e1ee1dbb99942f35a6cfcfa596ee18007b5b8f57e4a0b43d9e2b48c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 16044 bytes