Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ad6a89721dbcbe…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 20:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79eaf18d9bf0c28c51c4b048dd7d4c2d SHA-1: 5e6e470a593f26fbe458b957ca8c6b0f894a87b3 SHA-256: b5ad6a89721dbcbee63c7a413b08f68bb2d40a779d826102bedfa46e84faa2ca
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for SEO poisoning to attract victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819e3134584---rewodujewudezojoxodoza.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/mevifinowirutifuxezuba.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/84f2053d05640829e2fe079354e1ee80/tikibunevowazum.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/u72ir3h2qnilid0e66e1ijej63/70148556922.pdf
    • http://pokewaveanaheim.com/uploads/files/rujerurokadaxogokozokem.pdf
    • http://trendybiz.in/usersfiles/file/napokeku.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sacvgutealvskek3unmass05v4/41039345980.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f4381398---25428964236.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mggera7qe5b11806jo0mn6fe96/konirizilafazukawaneset.pdf
    • http://train-in-japan.com/images/blog//file/gugeritajetakuputo.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/13910465717.pdf
    • https://nbtele.com/en/cache/fck_files/file/zisabogerelesekekiw.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9401d11d0eaf70ee39758cd0562d6f28/folabitasufagubopiduxuve.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974da83444---negenirefoxefo.pdf
    • http://panziofabian.hu/fck_kepek/11817126128.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3bb9np3m2017utgmp5d18f2p7i/vuxusukivakiratonid.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095e3754660d---10716476943.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7a4d464a4b76847e5730d705678d3da6/kararutumesapawezivej.pdf
    • https://bcbc3399.com/upload/files/zimajelid.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pnqekc89rraebiha32co4pqfmo/verunexowujuvijamejevaw.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/62776620721.pdf
    • http://noospc.ru/SITE/files/editor/file/28659834132.pdf
    • https://petala.gr/userfiles/file/muzupekojadufogeledi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3533b04b9bd6d4beec9f3f384d77b2c4/90333575925.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+free+robux+in+phone
    • 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_off0000fcaf.bin
1bd2ae6b9305bda6cc614487e31f7b3dd0b3a1fda37831acee914546d7177b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 17016 bytes
font_01_sfnt_off000128f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes
font_02_sfnt_off0001410c.bin
cca497cf1146bf237ab7e2a4c2e5b17b71da94c2723bbaed66ebdea128c044fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 10680 bytes