Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff987a9070956f40…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 02:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 33f19278c07c91313e59779990eee985 SHA-1: eac46e83247b4851cdaf14f849361280087d08ba SHA-256: ff987a9070956f4086c1cd53a74005983778cde3b90d487f33c591cf35b29423
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to various domains, some of which are potentially compromised. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elitstroycraft.ru/source/file/85063267096.pdf In PDF document text
    • https://alohasafaris.com/files/62129175430.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/97434543307.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/80319036225.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/rapesajutarorevixom.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/talakogoxaf.pdfIn PDF document text
    • http://runo34.ru/attachments/file/wilimojepakitasisagi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/dugalepido.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/66057788003.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/63710821468.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/virelefeza.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mil7c8v35kcobr7jqan7ahfqdi/suliginezugekiramofimi.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/3031232671.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e987d98661fab4f848fa67bbf056ceb3.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e1234f64744dcf34498c7635f4688c82/zexuvazuxagenematatalini.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109040936301196.pdfIn PDF document text
    • http://geraldinekilkelly.ie/43372498726.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ab9241a2---86326678043.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/163172523383.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/55290142211.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/wofibozox.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/patadifenofibopalim.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_4F0249B66070B54C.pdfIn PDF document text
    • http://iphysiology.ru/upload/15538045004.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/pofurowafedujawasawiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+send+my+photos+to+my+sd+cardPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 17088 bytes
SHA-256: 0c4347b8c3ba6619919c159e224fc17bf4feb929ef4c8daf88438c480ed8d018
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 10924 bytes
SHA-256: dd6ae9cef211be220b4388c9f827b683ddd10d9fc3a1a8639ff6cda8fe0213e0

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