Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2c42042e064be0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09f91414f65392c4b9800bbf8509e33d SHA-1: 742a32a9245f46ece858b5c2d3f03470d053aec6 SHA-256: 2c2c42042e064be036208e289d18f3366cb5ede5ea42e15cb051ff76a2a4ee88
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=ipvanish+vpn+mod+apk+download PDF link annotation
    • http://zerosquareonline.com/file/36737113718.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e10460ecc12f31b8ab6ba46daae396f5/21292869880.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091306082071.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/12592512863.pdfIn PDF document text
    • https://riwg.in/userfiles/file/wixuparetosuzuxasuxilam.pdfIn PDF document text
    • http://tfforming.ru/d/files/59380335096.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906081832.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a832b9513d---pizafikedewepabenom.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162e5ae970---79735956735.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/11317222772.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/68991614048.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/sipagokex.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/navut.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/witedafunikaxugi.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///noromilinu.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210910_224626.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17cede5b2---23976472374.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/6632237805.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/sekarekuso.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/94643790070.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7798623876.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/rifosupuvi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fm8ij9tucqa2vfnv1sua3quef0/34415029738.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/migudokubotudaru.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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 10524 bytes
SHA-256: 2b31f5b2a8e4376192b3a451a0fd718d8956b834aed2cc14c94359daa81fd8da
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 17504 bytes
SHA-256: 30fea41278712e21bceb70ae08fb4ad8cc5b10ccdd1adf1b777f4d057b6fcb17
font_02_sfnt_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1