Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6583166ec93fee4…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 15:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d8cf2ff3357dc28c51e2114662fa286 SHA-1: a7d691dc1961f48b43f6b5375261efef1792bf8f SHA-256: f6583166ec93fee4df684a93d9b34d6381d96f9b0cf0ecab5a86d91db9d8b45d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing content, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60166278b9---48138417676.pdf In PDF document text
    • https://mycocoa.org/images/upload/files/ginoruwetijoxiwaji.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110892796c45---20677474390.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/79457129677.pdfIn PDF document text
    • https://kenadong.com/contents/files/bukofa.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/2abe8b4bd72652c406b41d9dff4cd97c/74583793015.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/091cfb07e0c7b1b33a0f88896099c04f/vututakewidubenebewamewaz.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/bezirugazovadapapizol.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dad7b9c78---vadexab.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/vijatibelavomebebanud.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3c020143---50327503520.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/569d6917653c074f8f577788c0dbdcd3/vamuvu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae3b58c5bf---94631421223.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/19616056240.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832e1e9b78---67007410086.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/rujegezojemuwebapesafiju.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/muxewiwinabi.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/16991707168.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9d5d31b3bfba2814bafa94c5c82f384f/81660443400.pdfIn PDF document text
    • https://zzwgjx.com/d/files/lorarufabu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/73ghehj1qij7je5f0cl7860rd3/47650431735.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea9bb24c4---47816374431.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/ditisabumilapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=celastrus+paniculatus+chemical+constituents+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 18072 bytes
SHA-256: 0f9bf7b0b4d8dd5047ef911cc23329c80dc840bf79faf2330ede4381501f176a
font_02_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 11016 bytes
SHA-256: 6c102556937962aa1c6f5993d193e217553175cf10fbbe375e50f23bfaecbfee