Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc880121619780c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 19:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de875993ced590a2aab0bd9ffda11528 SHA-1: 2f46eef56db36ef4265fa4eb0dd611e4dc5660b0 SHA-256: bcc880121619780c8a403455506c2d8c1c9d429a4ffb9cbbb2b199228d4cc4a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are also PDFs hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=download+mini+militia+invisible+mod+apk PDF link annotation
    • http://perchegouet.com/ckfinder/userfiles/files/53054686676.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/ravenuxumure.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/suwalusez.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/37a569664c00efdf96e1e36470f4801b/sedupetenir.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lipipaforoj.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/95784495920.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/95147827915.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/begenufabojemod.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/cd9c99543d11528df72c8645e9a6ab33/12603915278.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/aps1iv5qc22thetm5cb966roso/luvisepat.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/jinivagolowakod.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210908050829115.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/99504098657.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/fosavafiribik.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/32172662772.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/38602449606.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/romajuxe.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/jagusibe.pdfIn PDF document text
    • http://geasit.it/userfiles/files/51502147876.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e30096b5d---45956114265.pdfIn PDF document text
    • http://besteva.com/upload/files/50612290226.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161338f573fccb---zofoberuwadolofivagebabe.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/kimibofafolem.pdfIn PDF document text
    • 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_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 10840 bytes
SHA-256: 6c2714387abbea3ab1509f315e18a5b58b60c6624fa1ace072f90864f0037df3
font_02_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 17436 bytes
SHA-256: beb5e2301fbba294f8c4966d89b3c6823502d11950a200d8abaf58be45d63074

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