Malicious PDF — malware analysis report

Static analysis result for SHA-256 1181a933c2402c84…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 03:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10bc51f06e03830b62c20aaede1c1eb SHA-1: 212b68519f9916437854520ec6f40c9b5522525b SHA-256: 1181a933c2402c8421650bcc2178014f737ddac9799647e94102e8ba657f8589
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=connect+android+tablet+to+windows+10
    • https://jmtours.co/aym_image/files/72611160453.pdf
    • http://squash-fitness.cz/userfiles/file/10946355451.pdf
    • http://morard-mcf.fr/data/Files/13857537144.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/28458043072.pdf
    • https://lekkermooi.nl/userfiles/file/jivexasinovulepezus.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/35305920014.pdf
    • http://erago.cidees.com/uploads/files/94201838763.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0190cacb8cd2ed97b1a520d5126f437a/jasatalelafonamuse.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f2t3d7jdf0ege9bcalhn1jnc49/xodenefaji.pdf
    • https://ashleymongolia.mn/uploads/files/82463020128.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427066d18e5.pdf
    • https://tsolisp.com/files/file/86791963024.pdf
    • https://abyway.lv/images/ck_images/files/71379607078.pdf
    • https://norservis.com/files/files/69936437337.pdf
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/5886188669.pdf
    • http://hfengly.dk/skoleportalen/userfiles/file/fadimukabunu.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/muwatojifolalipemiva.pdf
    • https://fptica.ru/images/file/75087041706.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/momusilulifud.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/89976986265.pdf
    • http://milkyway-vn.com/upload/files/peredozipidilutadegiwoza.pdf
    • http://laiyi-art.com/userfiles/file/78055767174.pdf
    • https://mondoaudio.it/img/uploaded/file/35360042581.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_off0000b185.bin
ce6dd81a25d08e616d80c7b9d5a67f50ad77aa60461bb67ac2466c6bc5a01349
pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 10796 bytes
font_01_sfnt_off0000ca9e.bin
b9cf684f8956c2bfab24f57e8b55d2298566f61ff8f033c5cec929197a862f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 15624 bytes
font_02_sfnt_off0000f1eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 16792 bytes