Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6bc285dba9d113…

MALICIOUS

PDF

91.6 KB Created: 2021-08-11 06:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 380a3868bb02ca5bde2d69c9de98aa9f SHA-1: 94cb6405eee78718b18ee4fde9461988d38f6fa3 SHA-256: 3d6bc285dba9d113fedf9973b3cadbdb72a29e7fb54c5fc35dc70dfaf780f7cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6jh6u6q755sacl9hrqcbit4555/44190354606.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b217641fd112d6bde53fc1ce38c26aaa/33523327268.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/lenexiragutegelad.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca55d073a---kagabetet.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/vugile.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/26630240362.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/6967283291.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/govubenij.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zawiga.pdfIn PDF document text
    • http://anupbolivia.com/images/files/81781006462.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kibatexenadetib.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/re257out4vllnodl1ud78002l1/verosinekix.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/muwoxokufilemarakopevi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5cb94b317f---66523698318.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/48317009393.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/butiv.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/78731131911.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/43934480212.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/jujero.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4jejl6vb8cnhr860oc62a2g94m/tabotarogiwugodebadigefe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef3fc632d---57224758564.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607439ef47762---75949463010.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/74427223388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=roblox+mod+menu+2021+iosPDF 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_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10728 bytes
SHA-256: d9dc04cff1ddfe0a14d9a8417b7140b4eba931427e8802ff66c51154d21e7293
font_01_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 17560 bytes
SHA-256: d387e0660b4ce5def5306aced7b30d41fab9569c69c6861754458bdca2ac486d

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