Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a04f5c4730240dc…

MALICIOUS

PDF

77.2 KB Created: 2021-07-07 00:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: defc3494b094e7997e9d81a947dd2dcf SHA-1: daa0b93541fe80b56b35b0be7d58a825e623679f SHA-256: 3a04f5c4730240dca400be7e6ff2012eb8fcf3dbcef7135712df31a6be69e96e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://krisoc.ru/uplcv?utm_term=fs+20+android+mods PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e10eb9a95---69592398593.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/gozubiluzidalukinoniwika.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/78693530770.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c148f4f3049---21433457619.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9e5771ea---91877852446.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///bilalutezusun.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/nataletofinot.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/birurafatizor.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b06311dc41---lotufetu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_033152_105.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ec786d44---25113623764.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/vusisowovuwipamewa.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/24118664343.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/ginujigejefatanafopaw.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9562359a9cb0fbb92dabe84d0ff6b3e6/lizisoxamugatadujaka.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1c96942d---pegekunaxi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bd594e4---gepogus.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/dudir.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162498569628133919165.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/40f1e0fca462d178bff1d6ce2484a408/95799316760.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/38558531160.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/30212197844.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/milekalub.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8ae6df9e0503eb49c8a3e0396ed6add1/99549406495.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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16280 bytes
SHA-256: 5a729ffeb8da2a832f1a146d717159d082dd3a49ee003172820edfc7c91de946
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 10352 bytes
SHA-256: 3c1ae6c3ccb28f1d61427c25d10fa57d50e3f79142c4e4b1dbd5aea004f65be8
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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