Malicious PDF — malware analysis report

Static analysis result for SHA-256 1128c97709205557…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 18:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e775b8ef1e25fb465ae13d8c0b036ae SHA-1: db07fa445031cfcbeab4768735ffb8c7a997bd56 SHA-256: 1128c9770920555728786ebfb4e9cce51b51526401ff2dd0c22b173612900d60
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links points to a campaign leveraging these sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=yify+tv+series+apk
    • http://headlinesdinerla.com/uploads/files/gozugumemufigezibi.pdf
    • http://tbeaindia.com/userfiles/file/30444728473.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/jovalixosonamoxoviniji.pdf
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/tafiludeba.pdf
    • http://onfireinteriors.com/userfiles/39635189356.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/zuzujajejegaj.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/zagoxapimujukapobesiri.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131134e92877---satodumejekazosemelixa.pdf
    • http://thaisomboonautopart.com/userfiles/files/76728939872.pdf
    • https://kocarbonag.com/luutru/files/wupegevabukoladu.pdf
    • http://www.almansori-ye.com/almansorifiles/files/57834764970.pdf
    • http://staresecurity.com/userfiles/file/sifebopikiregavozular.pdf
    • http://tuvantindat.com/uploads/2021-09-08/images/files/pareb.pdf
    • https://livewireeventz.com/userfiles/file/89898234099.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210927_AE30BCED25698546.pdf
    • http://buydecor.ru/uploads/files/9631873397.pdf
    • http://gzsjlt.cn/userfiles/file/88470836101.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/b7a8dec47292c4a772fa53c33cc96522/66512666183.pdf
    • http://life-homeshop.com/asset/uploads/files/xulev.pdf
    • http://thedewakohchang.com/image/upload/File/253215328.pdf
    • http://sun-eko.eu/files/file/99696935425.pdf
    • http://gzhangqin.com/uploadfile/files/28415671193.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614215a54bb04---50964355010.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/39640565603.pdf
    • http://jrpst.pl/userfiles/file/sawebipudokumedowube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ac.bin
294797b0cbf6b938664dfbb7a213f50cb8f5a25dee9070faddfa6b758e0ae7f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AC 14612 bytes
font_01_sfnt_off0000d587.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 16792 bytes
font_02_sfnt_off0000ed9e.bin
b6d4957bc8fccae8e8fb682079b20ddbdd3829e90c57df64ecbf01f589a2592b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 10336 bytes