Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a2fae213b61ecc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 08:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20fe054ecb3cbab98673dd97df330acb SHA-1: e5a70dfa65e1968f83eff4f30e8a8ea344b0a65d SHA-256: 09a2fae213b61ecc04c47f06e45a33d8f4529671b8b32f20f4a6a550ca7bfe30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive use of external links points towards a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=cara+install+driver+qualcomm+manual PDF link annotation
    • http://e-store-sys.com/userfiles/file/wegiwosuxijiwatarininisat.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076c1d4cce81---25748818971.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/9617426079.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/tiwurakolikoraregokakelu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3605e443---73459294208.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/9943581027.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7b14aa85508fe1728dbdbb4ddc37a047/84590322819.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/odbl1u8ehvuvsmedcsn1lm56s7/xowij.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wuxozu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/velemubiv.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdcdbd562---1254387093.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/fapojaxozaxi.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/lapitaji.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/bumokor.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbbfcf39e29bb87edfb413e6ad674a24/redovavorixorurefamu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9481e9705---luxegidesij.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/af9304469c4aafb0f719de037acc2d60/rujide.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t1hfmoa0c3q2eadh9coq9vpr43/pilokasule.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/kemej.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/33560961638.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/85278722848.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8389a95c8---zowarujupali.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/64543837840.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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 18232 bytes
SHA-256: 5b9e9ae573858619d775047b1c7cf584a71b8e8cafeb1aa3831b3e3f5afdf8ed
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 10876 bytes
SHA-256: bc2536f7a7336655e41f970fd6cc2924e0f52d3d4018ff586f11e3a50e88a224

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