Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b0e5dfe119fb2f…

MALICIOUS

PDF

84.5 KB Created: 2021-08-03 22:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d2275e5e4c43385425396836d068b40 SHA-1: 10422675b1cf729932ed5de997d050f01df88e09 SHA-256: f1b0e5dfe119fb2f7878b9e649efa48344f7e255ec0e48f433635dd6b43b9a5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and the structure of the links suggest an effort to distribute malicious payloads or redirect users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a3827585---64839216272.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779434b361e---61588730718.pdfIn PDF document text
    • http://hongdacable.com/d/files/637782190.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/58585992870.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/dunaserepuror.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/74223152513.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2dbede4f9---48112572309.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/76461949837.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/88969382923.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/45837600355.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/af3155b5d1cdd1417bd43ecf76a07c89/40042094211.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/43092211655.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6b28413f---jakeweromawewani.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd2dc54896---raxibezebor.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/85b91a041ae4efb874b9386b0d6582c6/98344434112.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf38e5a7e7---xetejesotolubaviromale.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16070149db6b4e---xogexekubanupisafebape.pdfIn PDF document text
    • https://marosme.ro/hirek/file/pozuxopiwilegerulajutako.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de6f9045c2---84115214819.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/zopoju.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/89109844141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+play+dominoes+chicken+footPDF 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_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16652 bytes
SHA-256: 39465d014c8757ab8a9e3527c1f11a18e11bee38de31099e3fda2d0f58be23a2
font_01_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 11068 bytes
SHA-256: 8c23e460ac6b85d9a9a9d0ad010453ca16c4777db62c45746923ad4047a8015d

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