Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c48ebc81e79f7b…

MALICIOUS

PDF

80.2 KB Created: 2021-10-05 02:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0e8302a86eb43e04784e0ef346f60d9 SHA-1: 4fefce7f51096216a2cbbb45410e0a16cd1cddf9 SHA-256: b2c48ebc81e79f7bc5d11bf90d6aa888766d0b6ceeb286172887900d7f88f2b2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://airmon.hu/images/files/sivoliwekajivesuruka.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3b9f51fbe0af16aed32da7c93fb0279b/86556513080.pdfIn PDF document text
    • http://videocycling.info/files/file/zopesurovisox.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/poxelelosak.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/of3uah8nmv81hsl6mqnf1t0k73/78721700004.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mmcs6f321l7o19e4eaoptfnkl7/42364297394.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/regewu.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/gijuwuvomevatulaj.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/80318767690.pdfIn PDF document text
    • http://zenkatsu.dk/files/39634230206.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/biriperolovijanotom.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/98cc42d45976334bb8701494f94dadd5/dopiriba.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/da791d777d5c5b923329e03602411418/59419166211.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/37890105530.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210904_661938B2FA3FC610.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/37008573293.pdfIn PDF document text
    • http://etre-belle.su/images/file/83713516829.pdfIn PDF document text
    • http://gskrem.ru/img/file/73026314786.pdfIn PDF document text
    • http://salkim.com/userfiles/file/70322348432.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/rosat.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/muzulepexepizavaro.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/38786434914.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/bexetubitutiwazosib.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/duvigoximezenelirusibab.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/57890069139.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/50820904431.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/58282146686.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/42566489128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chihuahua+cross+breedsPDF link annotation
    • 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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 17068 bytes
SHA-256: dfa9e0f581d03f99ef9be58e5010acb640a472430eaa497a98a12843f01b5aa8
font_02_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 10492 bytes
SHA-256: a8d518dcceeec15ee8ea46c32c799c83cdd08b64dc92a1a8e62f1f152d6dede9