Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab00c772098929b8…

MALICIOUS

PDF

86.4 KB Created: 2021-08-23 19:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f13c9053a0af754943ce09f3976a5b9 SHA-1: 5b2be4d9e7ccf823768db501da863d857af7377b SHA-256: ab00c772098929b869f487257429224cb49e0f397821e8372e84fbc228ea6689
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external URIs and the specific heuristic firings strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://aitrans.org/UploadFile/file/F1202106290122211249.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891adc3995---26875050494.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/3150136187.pdfIn PDF document text
    • http://greenbrier101.com/userimages/pevoropovujusolujibopo.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/70596747451.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/069369f67e2ab0a18a6343ffbf7df580/26114626670.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/df96609ef51c2a9a8a9f6438bd08a9be/39148964924.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xonalazosenu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9458f33269379e0eecc9001945563b60/gojuwawutabawumugufo.pdfIn PDF document text
    • https://datawire.gr/files/files/rojapulagupuf.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3146d09a---deragiwiwuxa.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/wuzokufoxapefedexego.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f39e0aac5---nekaroreki.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/zezejixoluvilosidekapevob.pdfIn PDF document text
    • https://avenue102.com/uploads/file/68964846470.pdfIn PDF document text
    • https://swiz.eu/files/editor/zojedaxutatijosed.pdfIn PDF document text
    • https://menu2uplus.com/images/file/41784384432.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608059e813ce0---90048486784.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/kakokurebovasiwipexarolut.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/2kdmm6efkb39khj8aufls24sgi/xixilokotukomofebaru.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ef4b8f953efbc545777363daeb6b426b/nujutolofuboxa.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c8ca0526---fitakavedola.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/65468361740.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/84956704191.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/4cavhbevbota2osa36m95t50g7/82476807926.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/471m77ga80fov9k9837to49e90/supifetufosutefudami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=walmart+questions+and+answers+in+interviewPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 16748 bytes
SHA-256: 99fe5f70841b76c874fb659ea63f356195c7743f0503cf2763a281df22f2963a
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 1900 bytes
SHA-256: bced27375cd583721c63a2fc82da436771f52a2ccdb522a0980e792e2f9a23bb
font_02_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 10800 bytes
SHA-256: 07c3a1d37e3eb5ed5043fd70c8d7e1ade18731110969bead63b7498c7a52dd66

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