Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb678944036aa8…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 04:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c89a61702152f8a7c5252ab00a3213a2 SHA-1: b1229b3c3be0387be06528e4711185f32dbeb38f SHA-256: 9dcb678944036aa8b7ac131937137fc33ae2007a85ad0bd5754e5feb73a74b18
176 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URIs, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of a raw IP address in one of the URIs further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc10f53ad35---wepasanefafuvi.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d395ce8a---41917451075.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d5665c3f7eb7800886b22589f3907b60/21546379789.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a315d0aa4ab---3060020190.pdf
    • http://stellamaris.cz/userfiles/kodewurexemepobesalotivav.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/81443050d3a8fc1cd3e1dfdc38a03ad3/zanegoxisokilogod.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4c0f0deb---rebonomitum.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160761c08e5b78---38165522278.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a371b45a147---18019711641.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a7becd048---junigelabutesijamupekudop.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78d8a5d53---70238415254.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a299029482b01215fc0cd865309712bd/4987200032.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4fcd05be1---1393271473.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d5e8qc198paqg673grk35vg14i/25679247798.pdf
    • https://signika.pl/Upload/file/81513398283.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2bc2aaa2da5d8c41a420a812b1a804a5/86640347468.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742779b2d1b---zoviwulopatifilax.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd274ce50---xusefalukevelepufuzad.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506001340350019.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/93826071110.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5dad6afef---56492999801.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840eb52ac3---23666251547.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a9ce4a6532f31d7e7b674d37b3e1a67f/93512234717.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608428030dc9a---41510727707.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cake+icing+meaning
    • 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_off0000e0ef.bin
b8a3e9739967560e6e2cfff3677a4a9b4c7ee22dafb878f2bcbf62773d3636c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 10164 bytes
font_01_sfnt_off0000f7a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 16792 bytes
font_02_sfnt_off00010fb6.bin
ecd253b76ab5b1e0bd866171c31ab3f6ee0a5f5e4c185a788f103d1fcb5ec27d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 19684 bytes