Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbf3e220ea067be…

MALICIOUS

PDF

86.9 KB Created: 2021-07-25 20:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ecb65ebdc322d54a0e366b3481555e4 SHA-1: bbfce0d3ef090b523fae9dbf04d74e1e047481dd SHA-256: dfbf3e220ea067be5fa24e30573124fc35c59b4b6bd48ec807a5aee590f66d5b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or appear to be disposable. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gencshoworganizasyon.com/upload/ckfinder/files/13904303820.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f8389050216f1654e5c672bf0a82eec4/vugabofexikud.pdf
    • http://webbuilders.com/files/file/nulodebavunalezovatet.pdf
    • https://tomas-music.com/contents//files/91973628403.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/58aba2c4f2ffc70e08bb8c4f287d7690/dekuwa.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/gudenuvesexotuzikozume.pdf
    • http://intergeored.com/upload/File/dazipimupugunudorurupa.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc068023d8---76456478253.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080db64b232b---56348630096.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b095aeaa2785e62a47395f9415f7364a/18647372554.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db49d0f8c5---zizagezodu.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hc66qquje6etighbflhac1rmv1/79353532249.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6d59f96ff36f5b256dbcd40ea6581b4d/nodobowegi.pdf
    • http://suacona.com/clients/16856/File/9713713075.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/vazewezaxifenijabiw.pdf
    • https://alutat.com/data/file/wogamu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/597ecaf02061d9d5f7873a45dcd26032/doduderavebabu.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609160640636a---nozaranojekogirojo.pdf
    • http://orvosvalaszto.hu/uploads/files/pagofozivusikik.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/677d669444dda843cc0e24efbf966243/39622786750.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/memedofepotuwikifezejodu.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/4pebein27l9b8hirv8ijrsupqr/69089373374.pdf
    • http://preserveproperties.com/userfiles/files/9100072221.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/zulafobaruzuvat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bksb+test+examples
    • 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_off0000f0f0.bin
421ebf4b9aacb13b3a91f4c13265315602e9b951f0c8d8e57278abe08ab81c41
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10384 bytes
font_01_sfnt_off0001085d.bin
7866659252aa76626e0e3fff9275ab1d24c1d67021029077d645852df97c4fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17252 bytes
font_02_sfnt_off000135be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 16792 bytes