Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ebd4685ee254c7…

MALICIOUS

PDF

85.4 KB Created: 2021-08-04 08:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6cb1c3c2fffb3d0a0844c649f7b2605 SHA-1: f3f845f11720a5b522900db7bbb69b60f3d571af SHA-256: 67ebd4685ee254c7c266740ec6b0ca992a8a4613997a3d6ee910e5b2dc977926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, which is often used to host malicious content or redirect to exploit kits, supports this assessment. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/uplcv?utm_term=agree+disagree+statements+high+school PDF link annotation
    • http://www.peritaonline.es/ckfinder/userfiles/files/64342111934.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/76961489941.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/82099915566.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608aa57a141c3---28269352579.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/27087902424.pdfIn PDF document text
    • https://ienter.bg/files/damufujazolezadejoruvuvu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b3c62396---88571954696.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/kogug.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ls8q761b3akt01bn5eao7g35vh/6872269392.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c62822fa2ddc19e94a1592b3473893c8/rapamadodajam.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/30153683430.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/duxex.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/62650526842.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1db8b880e---dapovaw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbde59be1a2---92600959063.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927db3b249---53620932731.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e405cfbfdd235354d4f02fc28485631d/kuparasikitenuta.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/38788017272.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bf9a90800---gokijawosezixefidipojap.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/92000869325.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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16912 bytes
SHA-256: e5fc6d9c5bc0b9a2de67e14944a1e8fc5c0130753f5b70d2acf875e2c62362c6
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 10796 bytes
SHA-256: f3ae7588e31be48f18475009351e2fbaf3a6ba3e49eba6fb3185294829f2a997
font_02_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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