Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f9c19f1ed473c0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 11:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e6ec5b42c2d381c72c1fcbfdb5674cb SHA-1: 4b6aba5029965b64d8c82a6d8c30f24dbeec3a94 SHA-256: a9f9c19f1ed473c0ae0ba567ee52d51a22e54b8a4696c58e956675ca23f2dbe8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://archism.ru/uplcv?utm_term=10+latest+naija+songs PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145397bdb949---37333565855.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47d5ab30c---razopusalotub.pdfIn PDF document text
    • http://vhktn.at/images/content/files/xizorowugipufe.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16151e80fd5e4a---fupaz.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/gowujenu.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/3079040283.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/30764457936.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/50438241822.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/55924306441.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jididefidagi.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/bawibexatiwowidirovedife.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/guxagokupi.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/43693224009.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/24178930046.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/06a6e9717a4a9adf8cf9f0176067db87/jajunovozib.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vavovazex.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210924052059.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1cr5hck1ger4kffbfu09ljji0n/vigupexomekitikifowejitu.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/pases.pdfIn PDF document text
    • https://pokereshop.cz/data/file/papututeretalasipew.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/29545961091.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/xixawiruzewuwesezupoli.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/luvimezere.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/bowaxuwirorodaretarem.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/7705000936.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/mimidubifirosudirulum.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8q2nd5gdv2d6al38c5kfta7v32/dirimodidivaz.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_off0000b527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 10392 bytes
SHA-256: 1e5a49186724eb851f6644516935358b398338a96ce1699e8617a65f2bece48d
font_01_sfnt_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 16884 bytes
SHA-256: 66072835ee2edb04d31b491ecd72ad99be99bbc1988aaac692fb09813b2063f3
font_02_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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