Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da46f95c8bceff9…

MALICIOUS

PDF

81.5 KB Created: 2021-07-13 09:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b17e388a9bf5f819c39b8a9a40680b90 SHA-1: 2a019c53916fe9c62fdcfdc52b21d8e95bdde631 SHA-256: 4da46f95c8bceff97bd3c99722b2026653006a2317476ad3493bcfc715d0d497
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other unknown domains, suggesting it's used to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ecfab3c2224ddf8223296b6a57f8e0c2/xodim.pdf
    • http://lblussana.it/images/file/17234439053.pdf
    • https://holocaustresearch.pl/nowy/photo/file/67037369401.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b729b1cb7851d7e12832e0c434bd83b4/76633223131.pdf
    • http://iwishop.hu/file/nuninepiruwuwosemi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/cece6d5beb16368e38fc3056b7fd796c/92397766453.pdf
    • http://agapetown.net/ckfinder/userfiles/files/dafanuxaxerijobewuwidivi.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/13f1110918c90570e1150f6a4048ee54/nalurupegoru.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/51rgmrfa18qg0qcdr7lr8d7qkp/kodinabiwikofejide.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/92885372724.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adec664d91---6918932384.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/af88bee7c90f0db23fd12d9457b92033/76365398838.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da7569d1---jovidu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b13dce5b---sifufef.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d66cdae8865d57578a0fe3009d52bfaf/vibaridexirowije.pdf
    • http://worldcar.jp/userfiles/files/pogajokugozolulajifudi.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a90e32991e---buxobenosotesagelufi.pdf
    • http://briarcliff70.com/clients/874901/File/3857806470.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/56d5af2ec087362a1179846c5b1e92b2/degetuxedo.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f7122615f79a7bf3708438cf70120e9e/vududubo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb43d13c6---79717568072.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077273db63d8---89266540313.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b1913bef1c1---20895944636.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e752b757---98703407280.pdf
    • http://kripasec.com/userfiles/file/xumuseruzikobibusesaxal.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ca2823d40a883fec4e683d83c6aa329/32355729153.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/wikoriwemifepufuzirot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wwe+raw+vs+smackdown+2011+ppsspp
    • 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_off0000dafd.bin
3bb315f5173de29a439df751ef9e1adcc6814dfc3d9a3237cc4adc0be5391f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 10968 bytes
font_01_sfnt_off0000f48a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16792 bytes
font_02_sfnt_off00010c9c.bin
83103bfaf72053fb30b48760282c5a151b8b924851b015ed06708eecb203aa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 16784 bytes

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