Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b99c4688d3f008e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 01:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4388af7c874815ee37bfb7eb783e7d39 SHA-1: cb39732baaa4f584ccdd91e3b06c6c698d2a0259 SHA-256: 5b99c4688d3f008e724c2aecd9e971dad7ff2278d1ea8fa1fe40a83ad628e726
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, likely intended to lure users into clicking on malicious links. The presence of these links and the nature of the hosting suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/894106e287acd4d3c13beddf50811b58/nunukarebogebalotamej.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4420a3a1b66a78e6f3bc47b5e0d98cf8/wajufifegekepifibomexunos.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/53c96a7a291e8104be9f7c7972bcdabf/73276298735.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/xemuminode.pdfIn PDF document text
    • http://web68s.com/upload/files/18294193403.pdfIn PDF document text
    • http://orlickachata.cz/files/files/pafolaxagadezevefuto.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608324006ba5a---pawigolodijemez.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bgptpi3q7urhcbu0jgidmjuloa/wuvegenigodekijaladumip.pdfIn PDF document text
    • http://tele-video.ru/upload/files/dolixegejuj.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/pezudatisonijotufoxamopa.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/56801392413.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/56063827134.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/ditobikalaxanevadikude.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3af0764eb---kixizukaretufaf.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7e7d11180205c05c32a5583a0a4ee9ba/babojobusetuvedakitow.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086daf0128a7---kibarove.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/mubegurelibisitovari.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/wafosajoresadugi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/450cd98b9a666b564f759eedaaa48173/41455628123.pdfIn PDF document text
    • https://alariel.be/userfiles/file/14842000931.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8c86a708a---fukaru.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094294ad8afe---41193208141.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/watux.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/37516328574.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7c6df769---49480760400.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612559d39f528---besulexikitan.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/abc1910f5196ac09c51aed0be27f24e9/mosidawiposozopugigenirun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=philips+avent+manual+breast+pump+pricePDF 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 16856 bytes
SHA-256: 128acd68e0549125b437e245122de9a202a8eafe29e2b9dc08773ee6fa30a4fb
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 10828 bytes
SHA-256: 05c6970d1c67c42f7eabaab162bcc44d1636b9c3801dd4e41abfa057687c8f3e

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