Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d31737b1518977…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 02:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c02d2ffc2c1389342a8bebbc553c8fa SHA-1: b8d3a64d9efec5f0e5c9e77c22f75ba17f471ca0 SHA-256: 20d31737b1518977e671bae821cd0febc96fd4156e5b84178eb6bbaa6f3b6fc7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malware or lead users to malicious sites. The presence of numerous external URIs, many hosted on compromised WordPress sites, reinforces the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://botosani.ro/img/uploads/file/89348500767.pdf In PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/m7aqgaprtludnntbieaqbktmgp/xowanetitogimimota.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/krpcf4kfbrn43njr672bhpmv87/vemitagafokup.pdfIn PDF document text
    • https://jobtiara.com/files/files/31355536179.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8969766e6290957c1572e39e52739938/popepizi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wosudoge.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6is7iddmje162fn3ku6g9llrhk/31330345143.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a54090bc52c---kisagusefagupigivazina.pdfIn PDF document text
    • http://shophouse.info/images/files/67290361160.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/parululemifeleruz.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0acd98e157f2824178bb0b3c2ee533a4/mulijonikepogevudag.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/vibovuwofigowivovupal.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb26cc772f---vakejawededupit.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/xigamirimolalubadopeta.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e7401ef4---xogedirimonezozig.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/26615859265.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a8db7165380988ccaa9bb125dca394fe/70565011724.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/misalogisagekufu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/12337985693.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/48868893162.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/mipozafopapurakopeg.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/vikikosepadakuleves.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/63847288220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mixcraft+8+download+for+pcPDF 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_off0000b71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71A 15428 bytes
SHA-256: 66c99f9f4a8d02b9f90417edf2cd6038f58194cd5e0f2abf98da0a09055c447e
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10700 bytes
SHA-256: 3a12db99c01b909734303795b7dbd0e5a3fe7a49ea4c4bbaffd52ab3bb6adb6e

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