Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d405901e5d32d80…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 15:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 37d61197b3a0fcc6c2d4c434ffd993be SHA-1: 1fc3064819d13bde68cdf28d2b3d2ea7cec6f583 SHA-256: 4d405901e5d32d80ab4c94a821107768b135363f6238d5ec1723fea78f6c048b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or to phish user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://riskhedgetech.com/uploaded/file/12613838106094788b6b0e0.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/facbaf87c7008df1ad081847b42cb45a/37266887602.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a19e61168---tozisurekokatotanudavileb.pdfIn PDF document text
    • http://coumert.com/images/file/76675023042.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/53415434949.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/8871946093.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a20651bb19a393c13358a65008cb292a/52453739611.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/nasutegoderepadipipataz.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/povokebepubitunizaxepulo.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/favomezaxusivotogedete.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8e8d1b03c---40145229763.pdfIn PDF document text
    • https://funbugs.ie/files/file/koxevinejugazavejawezule.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/xasatireworikuviti.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/mepulevedijex.pdfIn PDF document text
    • https://stopserv.ru/files/file/69029631420.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0721499001623887134.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/basirexobutojafa.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/maditaxakiremolekaga.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/50763319926.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd8bdd387---89800992794.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/31233875507.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/50d60c35f62bfd7e36c9ef6141a3dec6/mozebefamapozawal.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/32768644291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lpp+simplex+method+solved+problems+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 10764 bytes
SHA-256: e6c1da63d01d034b251554b529990daa7cc4add482e1f18ed96655ac4b6c5b52
font_02_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 17160 bytes
SHA-256: 169bd58a8f14786d3aa774ef6f12ff6323f7b54662caa83fdde23522d1f2b14d

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