Malicious PDF — malware analysis report

Static analysis result for SHA-256 8623333da5ebd0fe…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 19:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a17a873266093ce300132462a30a407a SHA-1: a0e3c7962a0985c26f4048c37352e89a003db29b SHA-256: 8623333da5ebd0fedd2f529fec4a33f37e522fc0be0d20adc90a25dfad89ba91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple domains, many of which are hosted on potentially compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://yonseri.org/userfiles/files/suriregodejek.pdf In PDF document text
    • http://video-cycling.de/files/file/29642203895.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/nifogebusepudivawusuvoxo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d2051029b---rutovegolaj.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/97322318746.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/ginilarexel.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bc8f72f3cfed3d38b07215c2a34451f7/19348276769.pdfIn PDF document text
    • https://sakura-bashi.com/uploads//files/202108061432092719.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aac289a81---powibipagizad.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43185282943.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/28889542394.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2199nn4u6io9a85pgs7i6pav50/wopekurexotapapudakelux.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/kukusaziretatavubimi.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/busuvasufez.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/37956166994.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/mejoxurinox.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/62328368551.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/45998931957.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856fb116fe---57473873737.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608109d8a3cfb---wafad.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/25428f42755ab9f254a161822694342e/71897074452.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/vozalevufulev.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/99745719232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=flowers+in+the+aster+familyPDF 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_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 18416 bytes
SHA-256: 80955a03bd4ad6dc36097b48769b9d986a37b8d789553606b5eb797de6f734e6
font_01_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 10656 bytes
SHA-256: d5320d223042c4bdb8e933d81141f43b801576f1cbce0cb10be28c0c8fc53f98

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