Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4d6d745a87ca4e…

MALICIOUS

PDF

83.5 KB Created: 2021-07-19 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d2c0fabb50773c31779df409dd64972c SHA-1: 0b5ff96d3987a23565f658f02320eb19d7cf64b0 SHA-256: db4d6d745a87ca4e53062a71dc0fe4551149817aaf038d949490d977f1bc2c45
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress installations. These links likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/11bii2s99so3idsrlfl6ubsvcb/juminafudegojavigujoroxap.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafcf2093d6---lorawumitobuk.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f683a4a00ae1f1c2b982b31f2e94a74d/88891602686.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/42b76673a1ca7d565a9b5f933c795815/4918482902.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/malanetuwijevuzudad.pdfIn PDF document text
    • http://kelvista.lt/images/files/zagofujama.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vnlcr94bd0oask7usmb9ar33iv/42211944421.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e849655870035fcb07a31e43209e374b/64875795791.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/wavabudatog.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/92881740682.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/3911595291.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/sumakokulanozerijamifes.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/55701398475.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75a90f254---56870813308.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/57820463215.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/51468343214.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160abeb1fe0485---wifokoki.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/3497650434.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/84192175909.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160df36e0c462f---tijusojolapezezon.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc1359666---53375148208.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/5765912778.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/wipafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+accidental+prime+minister+movie+watch+onlinePDF 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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10892 bytes
SHA-256: 40f41644d14144a28878c263b90618df908734c7e1ac900bba5a40de492a27e5
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 17092 bytes
SHA-256: f57f28dea03cea83e7a2a2f7976ba5625b953b3f01cc15567fc86a3ab96a3efd