Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f98a37dd9ab5f4c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 13:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 906dfb874551431155fea70ff20b7db2 SHA-1: 08a5ae61651e4ffd43e1568d6be6bb8581e6b313 SHA-256: 0f98a37dd9ab5f4c0a783d637cedc7c56cd9f3da15a9be441bcb6ff3d7a789e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=marine+interview+questions+and+answers PDF link annotation
    • http://fw-simple.com/uploads/files/diwogumevusanomizap.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6e7e9b55482f5574399866aff49d7f7e/magir.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/38818458248.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/ropuzenumitosezubaduxeb.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbddbd38bd---xadidagofosota.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/81583390169.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/15452621176.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/99a75e6a21cfb993c5a6f21dcc553fc1/18421244849.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1628019942.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/agcq8rv86u51uvipsi3ei1nlon/sozigokepawikezere.pdfIn PDF document text
    • http://web68s.com/upload/files/zunugarorojofimej.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6851c934---62006083637.pdfIn PDF document text
    • http://samtekelektrik.com/files/pabojan.pdfIn PDF document text
    • http://chinahongji.com/d/files/fazijuvazutugo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7adeac01a5---vaxoxomoketonakugi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/76ec665728056bc32d5ecb876f0422b5/77997234656.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b619112dd---97887461673.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162516126030433503670.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/larafusiwurezalozitap.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/29110361573.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/18552185237.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe0fe5ffc---pixoximowuvizemu.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/42599405833.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/17185727550.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c142c6293db2e03efd710dc035118145/notoxofinoxosexejiwiru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10588 bytes
SHA-256: 64baf808ff195257a50e26b8e978b4648c0171f465a388a7491e91f1f114682f
font_02_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 17452 bytes
SHA-256: e3cad053cee79c0d0de99964dc25669ab4a0a5a0752cd8d3b85ea3e98a4db049

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