Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3757395afed172…

MALICIOUS

PDF

82.5 KB Created: 2021-08-15 05:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 698fa72bf07d8a367460426e7e3734f2 SHA-1: 9e4813de9ad0b9ec3d5194829acdc6579c8fd883 SHA-256: ab3757395afed172a0d57c131ff8d01d9647bcef60295123dd795e2f0f352767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests a social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ae7a32c1---81971388086.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8e64b9fc---66139827617.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609037335a1f8---ruwumufidosegowenatiwus.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/88865408806.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/nesokatenuxupirile.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/nedadotamebudazon.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/44438269306.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s0cqfv65amslv91aiaemqenj2a/44770952307.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ecb52b9cfded110d2f913460ff698ec8/53887544563.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f0c2b587c2c8d6dc16b6b0a9ee6459f9/4594476504.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1323015859.pdfIn PDF document text
    • https://elektrona.cz/files/file/30215069321.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81a82e618---22680397118.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0362b2cc2---18197973200.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6g6s4jhuehd7l6jj438vdf0s8i/puponuwuvul.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/sexudirub.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/814f2c540e4d585530ff0785e0587461/16690464111.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zufonen.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bdc87b5103c5283ffde02186c58a3b86/72958476226.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/10041215888.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/kafukexadibesuwexepu.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/zonululimupukarevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+cure+sacroiliac+joint+painPDF link annotation
    • 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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 15604 bytes
SHA-256: 08cb74f76cce85e83d929b903e1d54552b5c428bd82bacaf36e25576e42ea304
font_01_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 10928 bytes
SHA-256: 9b9cc6e4f1ab805772e06e00063b4a276369dd6e1d51d55b008bec31efe2b9fd
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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