Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea3f87a5f30a304…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9cee22a722a2175e9d87cffcd14ebdc SHA-1: 70928360f1a49c0a5c634dcddc259ee3ff21b84b SHA-256: aea3f87a5f30a304dc73fd2efcad8710424be6c571d0a9e51b9568993937d629
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to various external URLs, some of which are hosted on potentially compromised WordPress sites or IP addresses. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to distribute malicious content or phish users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://microcement.ua/userfiles/file/48063678814.pdf In PDF document text
    • https://anup.bo/images/files/bedigavukobopizeximukev.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/80638492490.pdfIn PDF document text
    • http://safetruck.gr/images/file/nupunaxotepemol.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/23531186403.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb6fdeb0b---48833609669.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/waguf.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/7475062448.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/40431234392.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/zudikulafe.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dobudexivozofuvafukawu.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/dabosamedawot.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/46556710310.pdfIn PDF document text
    • https://hirurgija.me/files/47801459260.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4399945a92f4b7b711b06969396ec807/favifus.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/57559295171.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zizebirukodenuwizopipenud.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/mumavozugiwodor.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/96014190920.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kodojivuna.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/lenoxalisulefoj.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/xesivifinekut.pdfPDF link annotation
    • https://geneolock.com/locktactyuma/userfiles/file/rotugobasot.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/62474875445.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b125b0e0---89280183290.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/2702299727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=video+tube+player+downloadPDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 10624 bytes
SHA-256: f9d02cc0639f231fc8ad906fb5750b862bdda2afd2c1fb12befaf86c5778fe83
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16912 bytes
SHA-256: a3cfb4f1be4b37f4a3aec87402b540ebd7340ee9fd3f7357d7e0f416cecff645
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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