Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94559699d26139d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 03:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9d89ae8ff83ae94abf56c5032d12469 SHA-1: b5f1a8f4c72b0eff5be051b33289a500bcd0d31b SHA-256: a94559699d26139d8edc24164d2d45953b5ac45d4d1b74a058459226cb7036a6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, embedding numerous URLs that likely lead to phishing or malware distribution sites. The PDF document itself contains obfuscated content, but the primary attack vector appears to be the embedded links designed to trick users into visiting malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=advanced+engineering+mathematics+by+rk+jain+pdf PDF link annotation
    • https://bimore.vn/webroot/img/files/9637559971.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/lerixufuxunugilekamifisev.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/65526000500.pdfIn PDF document text
    • https://dm288.com/slicice/file/jojofodepudilij.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/tidalaninoxobepenanevad.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/sisesevoxujuxoterutinipa.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/19750183328.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/65894152498.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7acc49736---53201423791.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pesuretemagopokuzuma.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/724651803.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/xefikonafewatabememesi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/19823880136.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/06ea9b988672432720fc888b922615c7/dasozamalokorabegovopexal.pdfIn PDF document text
    • http://cosyromania.com/media/file/jaluwozesi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40ad1e7be---60714726995.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_995D85D6C9C4E62E.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed70dc72cc---nalefuxugijiditiwuzipavu.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/9243346722.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25044af00---sidazupozozivobagurop.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zagafukarurizerovufas.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/16666788942.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/labipoxunudari.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_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 11424 bytes
SHA-256: baedb0b5e6265581405e411c7237e4d75f84b0fedae2b23317a51470a351fbc2
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 17176 bytes
SHA-256: 308d1553e13253cbbcca228b635bd767b60e4a8467e5adf9f759e394c7a6c029

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