Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f9a152e7472b80…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 05:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c950ba19bb6eeca1677d6f5d5a8c3135 SHA-1: 8b6eb61f3c80f986cefb325aa09bd41b7324a36c SHA-256: 51f9a152e7472b808301a8ceb90303d624a24cb47dc7eb8b53dc9f80dc46c3c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://anhuifan.com/upload_fck/file/2021-5-5/20210505202054457330.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3005deb0a9---wirimeruruxigopisidex.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/susofujetajuwinutotad.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u3ipjrq9i73dnt26fpd26n239k/gefifurororelejudupate.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vi51ucedkuoh17n187ggtht00f/kimikapawilijul.pdfIn PDF document text
    • http://wajl.net/img/file/202181015313.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/wuwovawewagovuwibulemasab.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/wufoza.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d720501ebf2df0ebf1c08d932eab43f4/dogufavo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67dbdb018ded97fff777f8a03db4c978/59452612526.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9d089f0d---kotogufaf.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/6870064530.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b42ab3dcaf8515fd271cb75c5a00b7ab/nugib.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/30097143500.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612394d262737---jexizilekez.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d23c65ec1f8968b21c31c14edaf6e120/48255337740.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kudbjpeponfrkbfa8i5g0pi60o/femigasibipo.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/rifodekiwipu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/bogegovatifevafakufurirun.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4827ece29st09lp2prc2cksc7i/9480026846.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/88864498653.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8221569f598c000119a28d77477d55b5/44290779040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=deer+grove+forest+preserve+mapPDF link annotation
    • 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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 15620 bytes
SHA-256: f9508c2b86a2421ab75181d86f3b573d7409c8d5f9ed1cbec8b7d2e9da783f53
font_01_sfnt_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 10528 bytes
SHA-256: 5911114ff352d215326b9d83547d7aecbd84a2dac56997817100f05c0586e568
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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