Malicious PDF — malware analysis report

Static analysis result for SHA-256 888ef8272457a719…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 07:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64926c874bc924b7f61cf49cb43fc911 SHA-1: 829ebccc0fbcfc01eaa25043e93a6f5d5e370904 SHA-256: 888ef8272457a719d29556a40647b229a9c94e708db5a410e49ddf1de41d343a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the malicious redirection intent.

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://queure.ru/uplcv?utm_term=lg+refrigerator+lfcc22426s+manual PDF link annotation
    • https://daxitrip.com/basefile/daxitripcom/files/69360668912.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/bowatojegobipatavisotosow.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da2e594d8---bodezarijamapubuma.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609241e6cc0d3---dumetapojetojigozo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b15f41f10---tuvezibi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0ee37632---73539573180.pdfIn PDF document text
    • https://o-dance.com/upload/files/tawipetipeniritegelajaw.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5f600124c98d639a72b0fa38e8e930ea/semexonijuxasamimipi.pdfIn PDF document text
    • http://edituj.cz/res/file/64226535972.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/genorufakavafasenosoraxaz.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/32294971298.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/88711906862.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/43788647403.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/97373965085.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/tizimaxamub.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/71059436014.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/viruvivabenisolelowon.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/22225553383.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rppk7gp0ad0q3srqe67qq8q866/7288455715.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/92185413405.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/016d8ba60b22f24c02ba8127d3ce2860/13081771412.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/75180f0544df171fcc44efa269c285cd/43879768460.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/7386265829.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/907b292567b21e2a7b7b3ad337653b4f/67801757165.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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 17128 bytes
SHA-256: cabc6154969c046fdb41591eebc30eb2efa95f7e964506e8e8cd58f351e52d69
font_01_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 11104 bytes
SHA-256: b8acb77e4654df26e3cbf4958f5d90c29e016f7d4cb7823c2f94ce0adb94ef41

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