Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5839fcfe43763bd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 02:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c34a64539e99a330e7a9f2ebfaad921 SHA-1: 812942b59464f334af7cbdce87ccc4a84dad1c31 SHA-256: d5839fcfe43763bd1826d226016bbf6c6a27da45a565e6f30e60d24ed5f9cf97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external links, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=android+network+utilities PDF link annotation
    • http://kosmonautika.ee/ckfinder/userfiles/files/56758803024.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kaxirikowa.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/dugot.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/galisod.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/6100415864.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/javiv.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210909060052_yzwtz1.pdfIn PDF document text
    • https://forumsevens.com/images/file/54081343799.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312ab2a15fd---24435853484.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/da03f2a886e15be30406054c424e70d8/figevoligabiwepolivolekum.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/zomabazotaxik.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/92568946598.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/63378392449.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/23401819619.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908012624_512181530.pdfIn PDF document text
    • http://jcpingie.be/public/files/82695155183.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/dubibekadalobi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300b523e1c2---wekikesuwolefuboz.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/serezibumokutoxu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jenorafuxazaroga.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/figupofakuvaloxusasure.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/saluzinav.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/19760431987.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///memituxuxe.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/kekedarusefif.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_off0000cb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 10336 bytes
SHA-256: d4f8ff95c881015866f0f971ebf458066015cb4171db51f2a61ea5cfcc333b43
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 18352 bytes
SHA-256: e2174d11138fd0875fcd264d5789e0791f54f70bc89e4a49b54e253f0e9d146b

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