Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d2798bc84fd1f9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 01:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f90554bba4e743438e522971ad815249 SHA-1: f398a44cc80c33e7d0c5a6d44723b074deeb5106 SHA-256: 45d2798bc84fd1f98f04cba8ab0a28e58de4bedb3952e85452f4ed061241ee85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious payloads or visiting phishing sites. No scripts were extracted, but the extensive use of link farms and compromised hosting points to a sophisticated distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=pensioner+life+certificate+form+pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/decd9c24643b06655ae4f5fc347b9941/56561498667.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/paxewuvogonaregerozoxa.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/31098843272.pdf
    • http://planetamama.ru/files/file/45736897188.pdf
    • https://villamishkan.com/310renonew/front/images/files/nexuvekukafadawibukis.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122eecb7d6---pojikadolax.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tajaxok.pdf
    • https://aitalk.vn/upload/files/siwaloxeb.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5502cde6a---82756753304.pdf
    • http://paolacaone.eu/userfiles/files/kuvelin.pdf
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/pofexefovefexonoti.pdf
    • http://www.atsamuihaus.com/image/upload/File/58132607674.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf903459d45---gisijoxulejunepa.pdf
    • http://hanabi-la.com/uploads/files/pobirefupatawaxi.pdf
    • http://didaconcept.com/admin/fckeditor/file/64237931529.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db80487025c---varud.pdf
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/9312370833.pdf
    • http://dungcucaytrong.com/images/files/tonegesawogugesebeda.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7vb1vgo71en2n02nrvnaofs0a3/93165832756.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pvmcn3efhtde78a6knb271ff88/pupogovizok.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c87bb319---74310868249.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8f24282296b918c92bded02e0632760d/wapibodemilujoworidazu.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/nibitujurug.pdf
    • http://chickendaylacrescenta.com/uploads/files/fadisexutigijowuluf.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_off0000df97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 16792 bytes
font_01_sfnt_off0000f7a9.bin
53ce022444b4ae0f7232ec153ff5587b4a726ab2467c6527f208d78d15bbb8bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 17528 bytes
font_02_sfnt_off000124d4.bin
9833ce90e0fb2faa9eed15892151afe49e44f6699734186f5732b70cdc50a3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D4 10780 bytes