Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b703e487fdf78d0…

MALICIOUS

PDF

83.0 KB Created: 2021-06-27 07:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 739cf110b3f9eb6525ae6f38b383c010 SHA-1: 314ea2c9e411153de8820d397da6cac233cf27eb SHA-256: 7b703e487fdf78d02662a0e9bb239e9bb5668e73bde3eb5dd5acf34b8e2b8d56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a phone number for a scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://medvor.ru/uplcv?utm_term=electrical+layout+symbols
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4b38ed0a228871d2eddd4ace44388636/85298127220.pdf
    • https://motacademy.it/file/mebolejoxipetenujemeleri.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9ca5b266---15585283313.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88b22e081---97004729465.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/c87ca20cfd95764643386c9c576afa48/robunitudis.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f03ad8797cf376c551f50aa20ee5b72a/81921945794.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/98a05655f1308658aa6a1be3be1233a0/99858316200.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e38863f398e4ca7ef36b295a9c68784c/wofuzejegoja.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c334e1359---47571007814.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f9482395---lujamumuwik.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8855b414fb28057c357a0810ed6e1d8c/silesixomigenur.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3b2491e46---guwuv.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077956303721---jekulunakunevomunadu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084495fd7763---lumigitibotexagubu.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072800e3c216---91266641393.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/13f2c8a22224025bb22ae73eaa544642/jodigilizumi.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/91123194728.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3b00126b---fololamobokadaxajozip.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac9e850bd---xeripejanudojep.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/29mvqp4v68pu6esaef4c36ckq0/99728729061.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8524a62d6df257606df0d050d6579ea3/67317023318.pdf
    • http://studiofapas.it/userfiles/files/40263490281.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_off0000e2ee.bin
ffb6ed9eab087961734129ddd9d232455320498e59e325c972196a583a75c093
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 10624 bytes
font_01_sfnt_off0000fb52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 16792 bytes
font_02_sfnt_off00011364.bin
185da1a4b34fc262f66605f2e754ce9d1365fcba541e16b64871f76cad90b159
pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 16828 bytes