Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4c2e6250f342f3…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 23:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 040f80afa21c9fbfd41265d63d017f01 SHA-1: dbc734f2cab9149fc517dbf9ca737908bbac4b23 SHA-256: 8c4c2e6250f342f3fd66e1ff91a283b8b48c7d6109670596c7d9da4cecdb270b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://playeasypiano.com/resources/fck_images/bewapo.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5uk43no2bvojms5arj0fjfcc98/81173877001.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bc3ba1691b8058091aa3edfc9428c5c2/79504437701.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01dceea28---2165697509.pdf
    • http://mamam.by/upload/File/file/47895393483.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b1e6097b---37741008290.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4ifafe7eaa9t5dret7qud9jqhg/zomunawosipuk.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c002de4---63559039352.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0a56381b32188b2121d971906bf83a0a/gamabiwexamekel.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160746c4ed728c---pilumazifitid.pdf
    • http://aloeverajuice.cz/files/file/79460371269.pdf
    • https://immobilgold.com/file/22274979551.pdf
    • http://a-kamen.com/userfiles/file/32957417654.pdf
    • http://langeline.com/ckeditor/upload/files/25772305524.pdf
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/ketore.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/472iplthrmj05lqedf1p3fpdv3/21718954476.pdf
    • https://scapetime.net/images/website/user/files/41173910155.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/10ea97701ed0c3907b6895c0d51e5508/fozawanozafad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reading+comprehension+past+simple+pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0fd388bb3e93b61c7f7fb92222603bc8/xepuxinizuxibipodudevop.pdf
    • 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_off0000f13d.bin
6187bc9a8240eacd45d7e95cc64ef83235dd52f953d7651af23b6c6f9a9eeca8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 11112 bytes
font_01_sfnt_off00010ab3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
font_02_sfnt_off000122c5.bin
91e27b8ecd068269c345a31f78b0131dc88f95aea88934255f1ab57e726079bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16616 bytes