Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0464ac13a428b0c…

MALICIOUS

PDF

89.6 KB Created: 2021-07-19 03:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e2cfdc6de0e915e27b5078125567278f SHA-1: 197328940d24ed5f8d48ac46bbf8dcb956f9cafe SHA-256: e0464ac13a428b0c152de0a9742ed2974a4e63c4115cdca0eb411f0216f1cec8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620fa3de5b---40517967714.pdf In PDF document text
    • http://broadgatecapital.com/userfiles/file/73569839815.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/68e027bf67ea18ed604ec811c0d3a08d/33702451112.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/naxagekofimevifaka.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad605ce706---22621733055.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jofj3ja7ad6fppl30avrs772s0/lefezeg.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/tozudevutaduzotada.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/fivakewodeloxukifot.pdfIn PDF document text
    • https://coatielectronica.com/files/61442829244.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3tdd5m8i860rjtaea3ftr3nt1o/12105377286.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d14449d12---tiwasurokuzulibejujiti.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aae708e3626---gisamojakukanelupavatini.pdfIn PDF document text
    • http://3q1p.com/upload/file/210603204835964770z7r2shgmuk4c.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c76ed2bd49b---86023710976.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/jevonaxologasatinagorewo.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/25502760362.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q3n4judeh6lolv01vhcfjpc7l0/53790221140.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nvtom2e9i6574dt1etqujri8rl/duvijapog.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6177aefe0a---7305546430.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/70609129009.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/93104917555.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/o14urq41kq19onbdiohmobo7c4/67164626845.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a27e1d3b1---60916316855.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/kabaniwivutomogufef.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/tinuwebusoxezudu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/un8ad5sabdjdhstfr3jm9ie9c1/83918160728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+giver+full+book+onlinePDF 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_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 10428 bytes
SHA-256: 2ab5e10ee19ba97998da39d34c58edbd000bf10164e470038aa17e817ddccf23
font_01_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 17044 bytes
SHA-256: fae40cae361475991fef39fd15b6b1f792042394a9fa23f7e4467370e0390fd9
font_02_sfnt_off00014105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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