Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6d8ad5a024c710…

MALICIOUS

PDF

139.0 KB Created: 2021-06-27 14:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 04414857a43baba27464297b8f861e06 SHA-1: 5343eb949e7948bb1f7f0e60070900fbd9249d5d SHA-256: bf6d8ad5a024c7107796774f058761e11759d7a9841b407b1114fb743ce363cd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs strongly indicate it's used as a lure to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 https://divinenine.net/userfiles/file/moxes.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/dixuxevo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/da674eae20810a7d8ac82e3f695d801a/96176546077.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/zodaxowipo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512025107270218.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/pukepegiwe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808503bb99---47443578114.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/bc6075c35069c5eb4645131bbc71639c/getagefasufatogit.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a15059b45f9---nerufevudapetojuf.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/q8q81gk66dgfc7mguis4bntome/99643624575.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/472rart2vka3t1svd7ku95gfnp/sigijagavuwuku.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2e308338d3f84c45ead4993c86930679/mureroxak.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/n8h6p8ut42f6qvptm05pa9ar6r/denikavugufeginar.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wisiboxunanipapusifu.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/3fba669f5d594ce6c0531457f09bfdcd/kivopegemadigari.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a17353b56142a06f41087c49c9fc3434/49190909561.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6c7d213dc926e384a41c505715551e9b/83521022914.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7602b9085---debare.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/854f632a1f414933b1c4077dd018217c/xigubofowujabodiwu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/76e31082b719dad04782364c1a816602/34952583446.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/tapukevoroxukuriravoxokov.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/18920392695.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4a171a6be---36260825804.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bhsfhrmd7c6rsnt40ckv212gp1/34584956843.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/negalekaterezoruda.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c8848d29---vedeboruda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=arkham+knight+gcpd+riddlePDF 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_off0001bfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFCA 10744 bytes
SHA-256: 1df088a784ca2e2f053d79e66baadfcb892e91c21eda934cd785e62e7f81a9cd
font_01_sfnt_off0001d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D819 17548 bytes
SHA-256: 1bf1e2e9498613b07e11848cb4ac8d2579a6d799609b59f3665182ee096a0a62
font_02_sfnt_off00020651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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