Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65279fd5e0549f5…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 22:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d3cf75a3cd10c06c2c060a4f2bca7cb SHA-1: dedde25d8386cd904bb98c3135c77864c58b2493 SHA-256: c65279fd5e0549f5ca87766369ef6fffd5508bc9a074b4453016f33199e8f78c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that directs users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f03ac8d63---26227016598.pdf
    • https://soalmatematik.com/userfiles/file/43462328110.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/teere87a3su6dn2grp317939no/85845647312.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a731b1981dc---33195182550.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/24829b981b33e2d8704b9153f31e1fb6/30833606046.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5b7fc722e7550613b0ad80aacf792b25/nenidepefisibezemozav.pdf
    • http://thuephotocopytaihanoi.com/upload/files/livofobo.pdf
    • http://daycamhoa.net/upload/UploadFiles/files/97941488878.pdf
    • http://kirilmazbardak.com/userfiles/file/xalejomi.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4a4877bd892021f840448b6faeb025d9/giwopijifarojitelokex.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080d74c26673---83304244967.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f833917a8124b6705e46df3bf2ed313d/21027770852.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/02ad2838835cbdcd2cdd1cc898f3d7fa/vovojudo.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/73095a1b934ec114d324089e954a2010/mutebokazegepuduwujoxat.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jco1pfakbg0qhbkkraekp339np/tonolemojirebagutobab.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0f28b145---bagepobolife.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ecbf9c9565bcca3b77782009740efb1a/fujon.pdf
    • http://ggmtc.net/userfiles/files/31651541555.pdf
    • https://reniuved.it/file/57734474088.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727167b63e3---25560340735.pdf
    • https://advantagelic.com/singhania/downloads/file/13409203042.pdf
    • http://langfordfinancialservices.com/userfiles/files/bonugigafikifanogumelimu.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/cd9eede5c460037b36519c812c525a02/95341596187.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66fce9d05---64246546280.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/9047581037.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=7+letter+words+containing+c
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea94.bin
3d7ae1097fb4551807ad4d446e794b161a346459d1908af4677e387b5c594e57
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 10584 bytes
font_01_sfnt_off000102c0.bin
aafd3ed40ad6968204baba7a526a100783915f2de1f786d963d85bd5c2db15cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 17132 bytes
font_02_sfnt_off00012e82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 16792 bytes