Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cfef0890359388…

MALICIOUS

PDF

107.9 KB Created: 2021-08-07 17:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cd7208d9a38848301b59d79f974517ca SHA-1: f1359a6c5e974e3df130a4bc21058b84559c421c SHA-256: f9cfef0890359388206ad7391d661adab2a3e429557643105324cebe7cc5d9cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=bebe+bapu+punjabi+status+sharechat PDF link annotation
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/42197826300.pdfIn PDF document text
    • https://makenie.com/upload/files/nodozenu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe191d90bc---kawanose.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/1116283371.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/08sss86osacqdj7dl6ettp6o44/jikorovanewel.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/78484548364.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adaf1b8ea7---60991703858.pdfIn PDF document text
    • https://ccskin.com/geektic/files/ziboxototupetogagowobidi.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a5621ca0---8061652599.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8a8909b1---fugituxibupebugusinefet.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0727347958.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8fef7599ec31d4e45e264d5320a97233/vadegomofenozoja.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f06ca987f---84632450133.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/nojiwozatakitadizilanomu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zajozodamivebe.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/1587316101.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec25c425b---61447618703.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/97069601593.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jumuvuwemokiwatorafeve.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89d57a718---nelibunededunesupefumisew.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/84426683189.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe72ad0317b---pisixonufirogiw.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090614264050---sujuxuxuzakavadafe.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9a934ea048611c3de3c39af500dba291/zavunaneledafatisajuf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 10728 bytes
SHA-256: a82a404fe5dbdabe888fa5417202c62f8e8b4d0858891954e985c2786e62981e
font_01_sfnt_off000138a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A8 17864 bytes
SHA-256: 96f2ce91afc5647e7f132178b57208177415afb3a91858f4fddf2ffa9d9fb48a
font_02_sfnt_off0001542a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542A 19968 bytes
SHA-256: df0b473636877049923a3d50348ae8f7c862ca8dfca45169b0a2c4d37a354f17
font_03_sfnt_off00018902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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