Malicious PDF — malware analysis report

Static analysis result for SHA-256 2499a22a5fb1a5a9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 08:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a2a7df53467cd86898a8ad641366171 SHA-1: a58d36a26a0c536d08f01b71ef6316e5df4add0d SHA-256: 2499a22a5fb1a5a9c323e10b6d446faef68c219387d47ad379eae6996680e701
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malicious PDF. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lienlacanien.com/img_pages/file/duxidapi.pdf
    • http://barcabianca.eu/upload/file/vofakedomu.pdf
    • http://polipack.ru/content/file/98318218805.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/jalidelefixuwoji.pdf
    • http://gemwishrs.com/ckfinder/stones/files/zinoravijovozajapix.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de446a5c6b---38271531609.pdf
    • https://parklanehotel.asia/userfiles/file/bakakobawuwelevegilile.pdf
    • https://tcremich.lu/files/files/90890915971.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/14423354787.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075803807198---63484882000.pdf
    • https://praktijkbinnenstad.nl/file/kidixowonowil.pdf
    • https://akamercedes.com/images/uploads/files/dobatemajasamopezarepozor.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca981aacd9---zoniretutizugovanamesa.pdf
    • http://stphilomenaonline.org/userfiles/file/13641228042.pdf
    • http://aweibel.com/Photo/file/nijobegajasumoviviz.pdf
    • http://faceconnects.com/ci/userfiles/files/jabinoj.pdf
    • https://htchninc.com/d/files/jekifalakigupinodemumof.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2d8bd4iaed9oc1hl6srkrkusb2/35253198697.pdf
    • http://apcmagon.com/userfiles/50124665994.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vcr54f0oit03juh91qsdrevbp6/damopoj.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/376b26b0b8d1240b197afee85d71443e/89739229448.pdf
    • http://kapsalonindex.nl/images/uploads/rajoguw.pdf
    • https://designclarf.it/file/kudipe.pdf
    • http://metisentry.net/ckfinder/userfiles/files/lujuwupenaxifezesipari.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3452966f7f---gejasader.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=names+of+animals+in+english+pdf
    • 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_off0000ce87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 16792 bytes
font_01_sfnt_off0000e69e.bin
49603c51631d5108b13ee73aa7fada9ac0f4665fbe66c97d4aca523f179d1f32
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 10724 bytes
font_02_sfnt_off0000fec1.bin
8352cf736f0eb72ee927947af76b6e2a9f42894516d5c143a020bfe8ca8f5c8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 17680 bytes