Malicious PDF — malware analysis report

Static analysis result for SHA-256 d714051a5e68cc3c…

MALICIOUS

PDF

120.2 KB Created: 2021-07-01 12:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90fe0376b27e5d0b1a8632fa70f8f673 SHA-1: 5aa12ec450ef3ad14b4202770ecbe871cd4397ed SHA-256: d714051a5e68cc3c11ad487cba09a895ec52d5e486722b1e28d5ffd46ba83aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

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://saporidelletnastore.it/file/98167068237.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc57a850ff---38473179282.pdf
    • http://bmsorganica.com/userfiles/file/melomituwe.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5dc36f46c28a46e617c4d6f1ff965f83/57252188432.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/9f57757g8crn2dimjinmrhfq37/gakilugelezobaxokasekaj.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094503a97aaa---62031443961.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3e5ecca6---26631344196.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12f248f7f---sibepaxipifibe.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sqve4bvf1jrmg5k15aherjrr74/fafatugevugugifewudefi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b281d0b9a05---botojetotexipanidek.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/iitg9c52lucipdlr4h0qivapp4/73164372138.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8381838ee---sifubezutawelaposefofupo.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/qh6j8k8gg70438b5trtddsa7vq/koriwuxoxiwalejixa.pdf
    • http://studiodabo.eu/userfiles/files/548514813.pdf
    • http://szentdorottyapatika.hu/files/sovivone.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e104411026---boweba.pdf
    • https://bonacorsi.it/file/581500355.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa920a501f9---6872613237.pdf
    • http://stalmost.pl/userfiles/file/fivinaguge.pdf
    • https://campermagazine.tv/public/file/95328800493.pdf
    • http://christschoolblr.in/userfiles/file/12394693816.pdf
    • https://himalayanthailand.com/image/upload/File/46843154343.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7293ae0376---38871010368.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dur+been+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defd.bin
ee10fc5899c269e3bcf8b20466853876b977a94bba25e98c46dd68bbbced7712
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 48680 bytes
font_01_sfnt_off00015eb9.bin
dff38966dbc9c60695d866f41834641a8b6f822428c49988f53a95d53f9aefea
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB9 16992 bytes
font_02_sfnt_off0001773b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1773B 16792 bytes
font_03_sfnt_off00018f4d.bin
dcbee73c51ac6249c5e7c3709c84a9a2765cb6afec5dffbc2ab95e9b064b39e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F4D 17760 bytes
font_04_sfnt_off0001bbbc.bin
12b08afc1cd85b537fd07960a8eec0269b07f9f64210494a8515821de4550851
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBBC 10248 bytes