Malicious PDF — malware analysis report

Static analysis result for SHA-256 be416bf764903268…

MALICIOUS

PDF

73.8 KB Created: 2021-08-30 03:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e25b55cc0030130f8f68bafd6eb4b650 SHA-1: 4b1bc677145ffc6d26f0853f5f2346e38e0fc4d5 SHA-256: be416bf76490326896c943f6d889915e95c2edc2d5135bf348829e4df46c4a4f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://apgr.eu/UserFiles/file/60562492062.pdf In PDF document text
    • http://jaht.com/userfiles/file/tonedu.pdfIn PDF document text
    • http://recrute.fr/files/files/34310306284.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/vosudanivip.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/45669116100.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc775b8d9---91120961158.pdfIn PDF document text
    • https://theurbanthinktank.com/files/xixulenukow.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/nuvevune.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/66630948939.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/jojuxaz.pdfIn PDF document text
    • https://designclarf.it/file/labivedogojiniro.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/16143146200.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/sinalo.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/87816062610.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ae07899c1f0d967c54b5a2f7bb6dc80b/18453501826.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/20533521904.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31effb7c94---ruxalatikefodinaka.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c675a419b0c11a5f784b66c8ab4cadbc/15871296985.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rlbu5fg1cc81qt7ota6568ark3/wazebixemonipuzuxiz.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/15439982841.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/gagijuzezolononuxofut.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/i8fgf8k4fklk9dn0kn7i0gh252/tatorexedotez.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2f0c06084e4f884d3323339a80a9675a/41070842357.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/jitagefolixakapujajoxovi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9558066015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=carcinogen+people+also+search+forPDF 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_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 16624 bytes
SHA-256: 90d5db187f6547d17102525e9b9851b53b5bda8febca864da949978a44c646fa
font_01_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 10692 bytes
SHA-256: 7dcc999027dd5c6a314b66e34a0bc8a632a5fcecf1c62ab5cfad5abc3b9e69e1

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