Malicious PDF — malware analysis report

Static analysis result for SHA-256 1342e90521ac1750…

MALICIOUS

PDF

105.0 KB Created: 2021-08-14 14:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f11cc182f395fa0f99ffad66159387e8 SHA-1: 674b78841a5daebac94741c4ef717247f5ddd910 SHA-256: 1342e90521ac1750e21e951d87da89e7f2fcd0f1e7959a76d77fd83374418e67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=actividades+de+formaci%C3%B3n+c%C3%ADvica+y+%C3%A9tica+4+grado PDF link annotation
    • http://minerva-collection.net/files/files/67611548465.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/netimoredovelabawezasobob.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/sezusuginijizagadifipulog.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825cd8317ec---piwejuledavuzexitimupafes.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8e011cfd---porasowujifej.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/aqm6faftgd6ofht883qtk70ns2/wemuropololekekonetopig.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b473a2653f2---61509228981.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/patajalotegup.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/290321741.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/22954980658.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/refupagosav.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/78283893250.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c78a44d20---17127694783.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0e9783e8c6926535444a54d6a0c43427/dosoxederufelajekemuximu.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/80975962442.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722fd554b85---raxip.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2d4a21c7f32714e51565bc8d3ed66c9d/7747734400.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8b4837e171c41b2d8271859dc1e38fa7/vuvibotajozuwi.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/30015012744.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/bafogotazowasela.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/toburomalofowonotefimo.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/dizodizaw.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4b1174b84ab5aec53efedb4761036e3d/75473938945.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1fee11060c61c499c123e6a2b9080f11/warobezodixa.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/vomifizat.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b586155f70c9516188a7abaceb77c802/39708779269.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_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 19204 bytes
SHA-256: 010afd3343bcec557104ccefbb2349b80cde17b14136a9ec3b701a535638a58f
font_01_sfnt_off00016095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AC 11368 bytes
SHA-256: 7a2d048846d42897d294e92c7cfbd30c3920169337a11c76b2b4b600303bf70b

Open this report in the interactive analyzer, or submit your own file for analysis.