Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a17206f64de3737…

MALICIOUS

PDF

90.6 KB Created: 2021-09-08 17:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a24915b5d03e8a52407219e30ea3f322 SHA-1: 486c19f7484d5bdae4f5d5a9973440b25798fd77 SHA-256: 7a17206f64de3737ff8466e0c8864cadbd3c1fce8ab556e76d41df9b19347cce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=jurnal+tentang+amdal+pdf PDF link annotation
    • http://guchen.ru/d/files/61348863802.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6d4152389e25a3da5899d8dae7a6d89a/pasozopafusi.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/3472145667.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wulusanogaj.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/19319227408.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/29142970179.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1757ade90---sasarusek.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/12295686039.pdfIn PDF document text
    • https://akemi.ro/hirek/file/lelotibovorivezat.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///walebumagopivusisu.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kufewotefelimi.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/duledes.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090508105037.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/65757060684.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zukim.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/30957564991.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/71858808634.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cdb1359b9---nobiwizowigunuz.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zibafamamuraguvolo.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/63813917696.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/20248067816.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/49806111737.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613837be0b9c8---gekuzugumujumugetir.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907191548.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/1525973274.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_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 18884 bytes
SHA-256: a2ac51863e3e219d7ac674ad49cd870f4e1fe469142416c39b1f44c06699d37d
font_01_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14559 10552 bytes
SHA-256: a63e88c3cc2a252c0c4c5d340ff6ad90a295f7209440e176ff0a17f8af94786b

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