Malicious PDF — malware analysis report

Static analysis result for SHA-256 a569fb31fb4e4202…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 04:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 310137480b04fcd325fb64850b29a163 SHA-1: e3b45e75e2401bcb1befc013454c383af5056088 SHA-256: a569fb31fb4e4202e38febc6fc4e5d9b20a36821c1e1fb7eb818e35626d4cf9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=pentax+iqzoom+120+manual PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j1k1oatja6iuki6sheigogop1q/32625139636.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/35929045381.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608434e78c741---50399357594.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/83082272770.pdfIn PDF document text
    • http://www.polni.si/Images/files/34586929555.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mowipivigoj.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/72676415387.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/af1d52122dd230b2031ca13964747827/44299372385.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/serurugipanafusefer.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/susaponewejonufid.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5beed776137506524cfd9627c865d9da/jobumokazoremepiwaj.pdfIn PDF document text
    • http://e-sportis.com/images/upload/5318769964.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/53659654982.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608657c0ed791---guwodukoboro.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/guberiridifalikon.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/tamakijag.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/xifariv.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xalapi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c177e8e40---megiwaketiw.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/fesevanikavetefixakuxini.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/pr1pok3vchln255siain7fgje4/bumiferejajujoxaj.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210627030437.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/16465552751.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/62486262944.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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 19208 bytes
SHA-256: 49b825296c63a937bf5f0a11f25d3cb3d778465a3371aa560c554f4e10a1c82a
font_01_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10704 bytes
SHA-256: e7d1ff79f464f2b6f0fe32400bdf249d6535eb9ef601d1916ea4a47b2c57fc56
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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