Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ae26e77cf63fd3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 23:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb9da74ed9440d113b30fcd069f90b0b SHA-1: ecf2b919b24b6597aaa10ac1b32e3bc5915f37ba SHA-256: e9ae26e77cf63fd3584facf6e6739851ae69fd9457c1c7d6edc57d3f785bddbb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many external URIs pointing to various domains, including compromised CMS upload directories. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=two+player+games+for+android PDF link annotation
    • https://biothiennam.com/media/ftp/file/gumewerikuwalemabojeleli.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/basabeg.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/masidalekisogewipujuwoda.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b98053eaaf---86988561297.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613851f55ff71---wegavizatuwimibazesojosa.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/36141369829.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/59948348503.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5cc30551---fikokuginalineri.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kibulaxom.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/86648920080.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fca7b6cc2---doruzujironotovikuzavufil.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/sesofojowo.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/41985885067.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/dibesepolivipiguzelepanal.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25370213222.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/matepinetefuwovomebivif.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/91626388247.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/mukopemusigib.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/muzerodimejisije.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631230242_1.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/91986973549.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24d5af3ef---68463126148.pdfIn PDF document text
    • http://termocity.by/pics/files/dejipisedusijodesemus.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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 10908 bytes
SHA-256: 43510d99d92a83e891ff02adfc90100a6934d8f01787fcd5ba716205e787bdac
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 17504 bytes
SHA-256: 5b1968d9dac3bd78e2b1098cb9172d6cf2740efc5644140997b8af285f1618b0
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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