Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc7cf4648a09ae3…

MALICIOUS

PDF

95.1 KB Created: 2021-07-02 20:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7f68506a84dd1cda97f3131a9fc8d6c SHA-1: 99fd3a0e1aa1ff19c2ad47e1d9ac7cc59f7122a5 SHA-256: dbc7cf4648a09ae35755d5b1e37ffdb7b98f7dd6a88d2cc62a7a219c5d6c62ef
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for issues like billing or refunds, a common tactic in tech-support scams. While no scripts were directly extracted, the presence of numerous embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a152ed82da---51830827122.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a4dd3bed1---31252147202.pdf
    • https://minlinart.com/archive/upload/files/voxamezidil.pdf
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/37948033589.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/9qnfvr19upmotcpaussc7npfvg/24618119891.pdf
    • https://amatnieks.com/pictures/image/39998543685.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/bawateva.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40f6f1d95---59393063252.pdf
    • http://brlairport.com/images/file/kudiwur.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/76948368830.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b425bbca978---dafajolisigajakedu.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/nuzulowevujibigopasalixaj.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e7aa86a91---naroxufojonujimo.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82ff624831---59291919558.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d27cfb2d---worizunonifi.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/efugi31mecr2chj0leg17donjl/57197905737.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68042c3f1---27306527891.pdf
    • https://stmarys-perthamboy.com/upload/File/sibozepirovaxuzinuvirasuj.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52337a7f8---refuwitepumetetodafosa.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb848c2255---belozexevosavisowube.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43c74a0ce5---kimofawapuda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=essays+by+bertrand+russell+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_off00011447.bin
8e8e68183f490ba1d0bec808064ca7e5fd46f5b3f3e8f499f5b9f6c29b0013d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 10616 bytes
font_01_sfnt_off00012c82.bin
098402d97b55494b1adb949dfaee0bc607b2b2469826c164b089fe0461cec5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 16596 bytes
font_02_sfnt_off00015799.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15799 16792 bytes

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