Malicious PDF — malware analysis report

Static analysis result for SHA-256 57786229fb8f1909…

MALICIOUS

PDF

84.6 KB Created: 2021-07-04 05:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2ff60167a02b19dc9bb81839ab25ea9 SHA-1: 2ae4dfadff469fc3c89548b2b491b71002cccaf3 SHA-256: 57786229fb8f1909e61045697fed94d9211e62672e8d3c0efaa754bd9a2b9b7d
156 Risk Score

Malware Insights

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

The PDF 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 CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://aklond.com/UploadFilesfile///2021050203340420.pdf
    • http://biotop-zamosc.pl/userfiles/file/munalojijigire.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/906370c3e0f5a1a6f34938a58f3435f1/litufisajulozasojofater.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c0d0c8de9f229575f00c4f07549c2a55/39451192898.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l2h1d31i0gbp06o0sq3c1cme7u/pofufozexugaragaven.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/xusudetipamanet.pdf
    • http://www.annaleehuber.com/content_files/file/2654993163.pdf
    • https://muratay.nl/userfiles/file/naket.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703e1202821---89633109830.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf6c4af7a---xisedatan.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/69992431561.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kagowida.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e108150d7---84209971796.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c162c6bdfe8---20251909876.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb718b260---23381769559.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/kezobukalawa.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7499a0ad9---77222051859.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/00f4bdb075af76893f4879753df0e79d/396524088.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df494fa8de9---6468626663.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad79d95f7---jetetaduxemokubok.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/nudamalojedidipusivawupaf.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b80e1b3415c351ecfedf4ddec52618e2/denijexit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=thinking+styles+and+learning+styles
    • 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_off0000ea17.bin
58e36403a278f2b105fe05815b0a7c76ee4abd44baa778f650f7da109ee88c1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 16832 bytes
font_01_sfnt_off00011557.bin
18409ecd63cf48198262f78c443b58c71648df5cce57617aea2d3f10795a4327
pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 10576 bytes
font_02_sfnt_off00012d3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 16792 bytes