Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7c392f5d30d780…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 14:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2366c2fb7ff876b4f4004ec374a88b4 SHA-1: c6c6cfca730bacbd5365ed375bcdd48bfee1bb2e SHA-256: 8e7c392f5d30d780a62b605ed3d6ada2bbfbdc19814150ca1da483a2883f7a06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with a phishing lure, likely intended to trick users into visiting malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aprenda-atdi.com/uploads/files/nixiwogisuwes.pdf
    • https://baatco.com/ckfinder/userfiles/files/fubatelalupupojexuzoze.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/q7nh239ipnvpfunovqqdiurpee/soguwinamo.pdf
    • http://gramercygrand.ru/files/file/24724543992.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/60e27a9a7ec312e76596309cd9f37afa/24019003916.pdf
    • http://gsxr.hu/userfiles/file/podomuxukewegotovuvola.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf83b3786---36876848428.pdf
    • https://agatanorek.com/files/file/62256387200.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16247055468795.pdf
    • http://faceconnects.com/ci/userfiles/files/bezir.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b160acba56ecb00eb8b17e284f2a7288/tovepunajok.pdf
    • http://dui-antidote.com/images/userfiles/file/tibabatoxobedesiket.pdf
    • http://oilandgaswork.com/userfiles/file/kebopinazel.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9d14954bec96715dac6b2ffbb2f37329/tatijewivoponexomade.pdf
    • http://moscow-vernisage.com/files/files/67495757784.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/cm69nt3k23bvio07t49bpgg8b2/zesadozomuzupegenibib.pdf
    • http://stardentalcare.org/userfiles/file/17473340994.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76bad6ddd---99755846002.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/tejuterixisemigutezibuk.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/vupaxivupufeluxeme.pdf
    • https://vegan-eshop.cz/data/file/48639441598.pdf
    • http://xnucleus.com/members/member_images/files/bazobowetalisafujiza.pdf
    • https://mobiligennari.com/userfiles/file/6181092298.pdf
    • http://uniroll.pl/user_images/file/22178184021.pdf
    • http://gloria-eurex.com/20164790143.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=unilateralidad+de+la+moral+y+bilateralidad+del+derecho+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d793.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
font_01_sfnt_off0000efaa.bin
a029ec92884ffbeea13a6dcc5c275c9e484425c64b8d5147aed5f8cbabfa8307
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10976 bytes
font_02_sfnt_off000108b1.bin
9bea58a4392ca247c033c04d722c3800640c6549a9915bf370c86114f20022f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 18420 bytes