Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f5cd7b98db12c0…

MALICIOUS

PDF

84.8 KB Created: 2021-07-02 21:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 183f956789b418383028c2da722c2c44 SHA-1: 1e466abd1927c81f84c952139be2823f1efb018e SHA-256: f1f5cd7b98db12c0e28968ce6e701d97eb12c715b11d6ab87bc8d2721de3597e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://forter.vn/hinhanh/file/jipom.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tmisqp4mehcjenbo9ffgin8p0b/7001269755.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/99ae5c652d71eb0ee82e82e30921737e/29918589355.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2hqj3p8lricipjfdojcbtmp1vs/jijugamotazorovazuferi.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160905b6fe5cdf---55274772647.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc26c718a---rafodemawuvajifozodeduxis.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/99354238937.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/45df53db03d1ae1eecd0bf632da8c8a5/20008890284.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c072bb3bd06---linaxifizid.pdf
    • https://banderlogclub.ru/Files/file/8648887846.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/p1mfuj9eeqj935ir7ifhs01su6/70254759995.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ecfe0f8bf82dae8ffd3161a22f557742/kedinegitegakixibo.pdf
    • http://stphilomenaonline.org/userfiles/file/migifetiv.pdf
    • https://a2designbg.com/userfiles/file/lawew.pdf
    • http://windmill-bv.com/userfiles/files/1133149980.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/311e29e3743ff60cbf5a58b6313510a5/29409268928.pdf
    • https://cgeminfos.ma/upload/file/70011140287.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ccevr1ar3gcgg8il9b00m10nf3/59430601944.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0102786ea7---muxodesanogiki.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bpb5bne6n4uu31rj9nguntn6o3/98328216554.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160967ce09518f---42483150306.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9alb63rkpj0535ofvh1k8dg1j8/borumaresufev.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e68346a68---xomozaxolomomitazokeves.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=collective+nouns+worksheet+answers
    • 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_off0000e614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16792 bytes
font_01_sfnt_off0000fe2b.bin
7bd16d5236289854871bac898ca89095661987ad914fbe7bdcdc1dd9665f8f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10704 bytes
font_02_sfnt_off000116c6.bin
74774a781bd72190d01fde75f0d390a19fc4f22ecb9ea0cf2c6dfb265dfffc73
pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 18656 bytes