Malicious PDF — malware analysis report

Static analysis result for SHA-256 af46daf430bdd5f2…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 01:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13ed5e42a0899a15c4a29781f187470c SHA-1: 2b24a3ea99e0a66f875a60cb7a7024edf3672b09 SHA-256: af46daf430bdd5f258909a86abe032e936ab4c384deb64758e4e315bc343be9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and potentially disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. The PDF structure itself is heavily obfuscated and contains no readable document body, reinforcing its role as a container for external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6vu8h466o0jn0lq3et234a2afg/44016817104.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5dd05d58b08850c8bedb78dfa2eaa5e3/ferojixew.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a8880a8a---rekuwejos.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/95d22e10e0a7e492237a16eb197836a4/71137990406.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b891a7da24---sopisatewejol.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493f750fb3---rusutaxukinelewa.pdf
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/wafomurekujuzor.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2a8ea5a040323097803a792534437ea/lemapujiborujuzemumone.pdf
    • https://universal4shipping.net/userfiles/file/diveriwanoxalegixoxagun.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4c9d5886---napiroginoredadimovewefib.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/gawopujosikisiwitipemave.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946692c01b3---93986124992.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa4d08fb9---semimevakilu.pdf
    • http://zeroseistudio.eu/userfiles/files/22691194379.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/66551a133d465f098c342cf06aad075d/68619710666.pdf
    • http://www.victoriousintl.com/new/resource/files/8737251057.pdf
    • http://iphysiology.ru/upload/47743461395.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e1184f24---gagatikajaxi.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160870b42ad4c4---gupojirapikaza.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/31745968630.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da3c36bb019---lebesepofilu.pdf
    • http://aldo-ins.com/userfiles/file/51971912381.pdf
    • http://caphegiabao.com/upload/fck/file/vuzudageteluremetege.pdf
    • https://fallsplat.se/file/baxemuzesejip.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9d76b6da2a19261135702625ab520502/51760761691.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=counting+outcomes+worksheet
    • 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_off0000ee26.bin
8e529c86ca6d657ccca4d46a2e691f3ca64011470c71ca78b80bec0c29ffeb4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 10776 bytes
font_01_sfnt_off000106ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
font_02_sfnt_off00011f00.bin
f30ca897d3f1f6c464ad468de2edc01e50d64a9ed88ef40d21d32d6ea65c9d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 17720 bytes

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