Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf31cc6cac26b29…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 02:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb3478502ffad381219a18cb7ded896d SHA-1: 7aec42feec92be65c810616bf97305c2d924d9f3 SHA-256: 1cf31cc6cac26b293c72c85347cebd68b0fe192f3aab555557ccdbc6804a2158
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of a 'utm_term' parameter in one URL suggests an attempt at SEO poisoning or phishing. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=mobile+legends+bang+bang+download+pc+2020 PDF link annotation
    • http://fli.edu.mn/ckfinder/userfiles/files/83208548926.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/80274177918.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/60243716944.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16e4e1f28---pinenagigexawobonofame.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/14947889065.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/75002187384.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/85538977472.pdfIn PDF document text
    • https://timminsrenovations.ca/file/d4IvOnNRhADhh6S1.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/gaxanapaxakapokew.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091206011438.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/93741004144.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/29163107678.pdfIn PDF document text
    • http://konberdbio.com/upload/files/439329188.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161393d29f2677---28523043841.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_6501309E7529AC10.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/82778911902.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/tokuzujixafawobapuzolej.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/81276940124.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/vazojozosexukasaxa.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/kuwidezejo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h11ie2u9n7kbsqh1anho0frtv3/65281104148.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/toxiz.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e47e47ae29f85aaec98e3413d446d951/xibuzelexanuv.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/92378239312.pdfIn PDF document text
    • 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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 10952 bytes
SHA-256: 43f278de49e835d7cd8a42b2bfbb2c5b2111477effa5cea2e01b7b58e22bf839
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 17260 bytes
SHA-256: 03c723dabcffc75a42c7c94e0b580daefb0385c62ab4394b68ba8545a7387da9

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