Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0d7f35573621bd…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 23:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec9d9a22393a888588eb430e59bff564 SHA-1: e60156e0012e0ecb76e1e58bc9cd4b582d8724b3 SHA-256: fa0d7f35573621bddc6e57b56d02e47acc592810620d53f3d94667add82e6d82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, 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 a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=android+mobile+display+problem
    • https://termokingbt.com/ckfinder/userfiles/files/95431262074.pdf
    • http://industrialsupplies.pk/userfiles/files/vogozinab.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/musisofitasa.pdf
    • http://kingkady.com/uploadfile/files/87746910627.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0dbd86cfe0b3e3b12f156d3f69bd8625/60020365601.pdf
    • http://rainhouse.kr/data/editor/file/3576471286130f5bb42f13.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bbf47c26---74091761559.pdf
    • http://szhlfz.net/upload/49901600630.pdf
    • http://3mfa.com/images/editor/files/zifusitenizeriwadurubejos.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/xegozekegojipida.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161430a2b15815---66668042443.pdf
    • http://crabandclaw.com/uploads/files/78158363407.pdf
    • https://minipowerpack.net/upload/files/95528216502.pdf
    • http://thegioimaychaybo.com/app/webroot/uploads/files/rawokuzosifepedita.pdf
    • https://cet.sk/res/file/4539886000.pdf
    • http://xhiehchin.com/Xhieh_News/_file/36122088356.pdf
    • http://elskup.pl/images/assets/file/bizajukiwi.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/83166499031.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/95141246882.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/furanadezaritizeduxojab.pdf
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/14547322203.pdf
    • https://datenglagi.com/contents/files/sudep.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f3eafe2d---23253299542.pdf
    • http://vinaaquachem.com/uploads/files/xebobaxogu.pdf
    • https://iqrainternationalschool.org/_assets/files/62990817501.pdf
    • https://cowik.pl/upload/beravesoke.pdf
    • http://zamdq.com/filespath/files/20210903213211.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_off0000f61a.bin
95a153217ccab2c617dff08ab527b566c366b1c77204ca4b3f3689bdcaff5972
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 10692 bytes
font_01_sfnt_off00010e52.bin
bbb82c911420cc52f9ccc78509fd526f6d7d6d381121dfa92e75f6ec148c3788
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 18072 bytes
font_02_sfnt_off00013d2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 16792 bytes