Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1cb791ebd943b5…

MALICIOUS

PDF

73.3 KB Created: 2021-08-31 20:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 017ec5acfa9f438794060fc1222fb777 SHA-1: d294240dea52e88a1e106b6f7b04be20d11515aa SHA-256: ac1cb791ebd943b5727cd2ffd4939b38c77ae43c9425eca223ddf9e3511e0d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of multiple suspicious URLs and the overall heuristic profile point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://pistant.ru/uplcv?utm_term=organisational+restructuring+pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/52b1eab64332fb3f27ba927a35606115/jakorujeribefire.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115a9b0bc178---57525956978.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-8-24/20210824094221943886.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d3548347---4686191364.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0dnmrfsphu0e9v84h12ugdvc8i/50384945328.pdf
    • http://derey.nl/app/webroot/files/userfiles/files/50947257206.pdf
    • https://ocw.tw/uploads/files/18605783130.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8a3050811b5fc27e856c0495f1fbbbe5/gagufumolijebo.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/72592919085.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9972de21457cb3efad84e69c190886b7/salugu.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8epg8l7q53vhhol3c5gn2ltf1h/71073300438.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c10d484ab13---pabanorumevodanalipato.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d972a43ee---gujezi.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b737d0b73---likupukijadowaz.pdf
    • https://vntdc.com/upload/fck/file/98863724041.pdf
    • http://blessingsngo.in/userfiles/files/73826106255.pdf
    • http://dzbnf.com/upload/file///kanadisudegojo.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608804ad32cae---xesizinasixusizi.pdf
    • http://haniltm.kr/upfiles/editor/files/32611709689.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071215dc8eac---powitab.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b82edb345---savigelu.pdf
    • https://landi-bg.com/images/file/gesug.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8cc58a24c57326a089fae66bca40e0a2/nowinotevojurexisuxa.pdf
    • http://anabakorea.jp/userfiles/file/pedizuxosetaru.pdf
    • https://mytopics.it/uploads/file/pogagixaduribezivunarik.pdf
    • http://medlab.webd.pl/upload/file/gejezebuwafesenemavowem.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_off0000bce8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE8 16792 bytes
font_01_sfnt_off0000d4fa.bin
1d973c89a191f3d0efafdee6ac55e2dab725c673febbdd384032f27a39d9ba41
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 16104 bytes
font_02_sfnt_off0000fdea.bin
1d3d4a031ad8ef358b907a91b92434a4e2e54830204c3385f73993145967fa59
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 10920 bytes