Malicious PDF — malware analysis report

Static analysis result for SHA-256 1346ec1a12881b9e…

MALICIOUS

PDF

100.6 KB Created: 2021-09-17 00:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df0b443106bec6b55863dad55b599774 SHA-1: 7e18f802a1de22842331166eb07ebfbfbdb6e4f5 SHA-256: 1346ec1a12881b9ebd49f80c9d30072ef02188a37a53f49304710745fc2d1474
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://ztkammer.at/uploads/file/47521708172.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/52951433171.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161435da43f126---mukijimilom.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/38703190010.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/26408737327.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rizilatagejime.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/25519845462.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/gerepuxazimogakow.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gam8ltvuo1mgdr03gsc8h24sv7/dujarixewafaw.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/dupobikumof.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/92246488651.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/mukinoludovase.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/60347323386.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/jasuxibalegi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/kiwifesukenipatu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/chgbr7h18fanoasbf4j5t85rvc/zelivuwawowexup.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/xanujozipunor.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/39611845600.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/zamediwesumitugajupu.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/6916088254.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/72158325896.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/13821997734.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/gumurajulalabi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360396c8fce---jokebazebabagupajitadika.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/lozedanazuborota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=can+i+use+my+phone+as+a+modemPDF 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_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 10656 bytes
SHA-256: fb32aa99e595ec54a08ec0744428dbe2a5c2d93f67784301f868375ac385eee4
font_01_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 20032 bytes
SHA-256: 94e79100de94dbba70c1dc905b7ee8f4a7be169a9ab9a7c15024d2fecc9ef03b
font_02_sfnt_off00016c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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