Malicious PDF — malware analysis report

Static analysis result for SHA-256 f936382d2516efad…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 23:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57fa252b264b43f475ec1291011b0c19 SHA-1: 8ada4b1c2e8cd0ee40adc8a48a59f7b564e4755d SHA-256: f936382d2516efad7b02d95c3e85056b0f517ee636c2285728f96e92d0c425cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=android+application+singleton+example PDF link annotation
    • http://kcpsystem.com/userData/board/file/32154880920.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d0cecec08---kogakejepupizomipujojuvi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/98652033037.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/gasabajepologiruki.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fd28a3fb38be404b2eeedc8774227333/53083135257.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/pubiritalesetamagaliw.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/nonutuvapivenezowip.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613539ddb0229---63492023636.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/jizuzuzibofetunuzixiro.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/85140449168.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://tonwen.org/userfiles/file/bozirovulupixumudelatunos.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/benudelixemexas.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f2706278e373150f8d6c8b36f5a55770/57913506830.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210918154710.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/tirinuxavovuk.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/46508295378.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/zavawofukuzafase.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/lagomufukonibinanup.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/fepaferagotizoripapa.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/54645418790.pdfIn PDF document text
    • https://intersat.lv/files/file/gibawugavanazaxodut.pdfIn PDF document text
    • https://12shio3.com/contents/files/nemuxatanijex.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1631425724064.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/sezagelam.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_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 10940 bytes
SHA-256: 68ee788d300c4d2a870ecc28033fc3a90ffd231ff49d23897eacc0708e1be878
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 19184 bytes
SHA-256: 802c52caa8ddfa4d98df95600482394a8efb0b28cb2f3d60e6d0bea66ccfa6e5

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