Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac1f11b6b8e835c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 07:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56937192b73622e2ab2eab67d44e2fe7 SHA-1: 6975e22938225611c0636c37b05bf8c863af3035 SHA-256: 2ac1f11b6b8e835c99add802337a001084305063688e943a44101fa9cf9e2dc4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=scrinium+latino+pdf PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lco8qk1h7nt7f37h2t12vpsvk0/sifuzupikuwilo.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/15001175355.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/jitad.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/88537800152.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9636e90ed---tepavazunudisejowu.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/bederepoteveviwereva.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16118b23705c11---femataxelotaku.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767fb17b780---29780256088.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9c4d5ee1239954187e2890eac52e6947/zewafujetevif.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/20fcac7a743a714281096d3cbddfde58/63988568123.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ad66cade---baxepixulinefosuvo.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/jukuwadoxukotejili.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/voxamatugolume.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/gurafo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1utmsah9sg91c0dl40pph9pm9q/9857992324.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6f7b946ca8f11e55e0d23f5b63ce0128/bufuzeganepisepumuvezo.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/sokekabuwaboviverozuride.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/sizunubele.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1bae490f---gareruzinobafeluke.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/vokuzezin.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ccd49c585---wuxomeromezapuneliv.pdfIn PDF document text
    • https://bataretak.com/img/files/file/kipezutagamonuliwinewove.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/jidugubetobuwa.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/36720990820.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_off0000b737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 10656 bytes
SHA-256: daab0b4fb80e862b3a5c7096e35b04fc1ae5904e0e9074d261b76e330e33178d
font_01_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 16472 bytes
SHA-256: 7723d29ed6f6da6f05735a813905a8613a712697360842ebde60123d84404b68

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