Malicious PDF — malware analysis report

Static analysis result for SHA-256 f422c69285b3375d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 20:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ae632386c998a8ded8a395f344e8396 SHA-1: 24674c24fd8578262dbdccd05e6605353726262f SHA-256: f422c69285b3375d0577e1275dbbb549e6a91f19cb36aa867c232e88a773d30f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=screen+recorder+for+android+9+with+internal+audio+recording PDF link annotation
    • https://begili.com/uploads/image/files/makodugotadexojulodo.pdfIn PDF document text
    • http://domuran.pl/files/file/55727973486.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/satixizugibuzodataf.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/gezevalisebu.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/rabomalis.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d4bd01cf---bimeje.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/befepexug.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/mojej.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/90521550726.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/81671984880.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210904104329.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/23996718862.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/tigagaradogalakerusufore.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210904184651.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140f06cafbdb---26186580817.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/lejaludulomuxun.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/kobidagupu.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/lemidipalejokilinotan.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/93545467669.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/fukivoji.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/98855240058.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lewugozegejevulodakesofu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff31704bf---batob.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/94573000403.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_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 18188 bytes
SHA-256: 0ea3a6c9e7060ca59222e929a2144712a8da8e05778018c614236de006f354eb
font_01_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 11016 bytes
SHA-256: f97b2227c34ecc2b2fb2b29d7616e9e8b14aa3f7f040f147bfbe06a0d33e239d
font_02_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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