Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff5e1113231d8c9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 00:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e870806b6df876b1ac31ed7aebee089 SHA-1: 597a42b452cf953ad84e8002b6c67fc48691a749 SHA-256: 5ff5e1113231d8c98fa70f175abe73544446547abfb8829db426e368ac8a28f5
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=dragon+ball+xenoverse+2+iso+ppsspp+download PDF link annotation
    • http://abwingscolley.com/uploads/files/14868505296.pdfIn PDF document text
    • http://njchemland.com/upload/files/78520198212.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210911122652.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210918_04514D9FCCD4D8BF.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zutigivubetinigegun.pdfIn PDF document text
    • http://wsm.hk/images/files/86866821892.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6a951519---65740273854.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/fukus.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/fixex.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/6411738415.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/vopefugilipusiregapuwo.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/85743954651.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/gijevesiguneterosuxiziv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419736a40d1---fuvajiduwawen.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/ruwufidopix.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/takupiliwifiko.pdfIn PDF document text
    • http://quetthe.com/upload/files/37569269007.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb2b8a95b---xarimu.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/labidipevavozikipejamub.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/8854436657.pdfIn PDF document text
    • http://ranch.pl/files/file/pubojibetolaji.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/73132760860.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d31b8603---28025559716.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/viwiwozebojusimamawo.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 18456 bytes
SHA-256: d389d41410bfd7e97130291298a791e7a5034c11d5c3d5059de655a207be5dd0
font_02_sfnt_off00012b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 10984 bytes
SHA-256: f3899bb950337df401b60c044ecc51dea21ff57e76f6e71719f2bbab6fa37956

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