Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ae2a5666e30b0f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 20:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 60bf6560be65316937d43ef1e65f35bb SHA-1: 36a1f28cd99c09c29c6d2c0926655cbfa4d421e1 SHA-256: 89ae2a5666e30b0f2b25e687465e21c2660af3ecfd77e10b7230525b0cef53d0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9955

Heuristics 8

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://aslimitada.com/userfiles/file/19903898730.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b925628669f---68676070051.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/41382253948.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c9caa5c9700---sujokaselamo.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512164753341519.pdfIn PDF document text
    • http://e-sportis.com/images/upload/zebasiwopu.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/62228464819.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0c28d662b58131d437a3f782ee50940f/pulodawedibenuwajumowi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/46353273358.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/degufokamofazizadedud.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e4d99345---44186807856.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/5411350845.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/dojofowifov.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/64367618969.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f13f466097c0c793bd2785dc0a865aa/16938372371.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b6d98a3b---5782770777.pdfIn PDF document text
    • http://www.heksan.com.pl/file/95456861833.pdfIn PDF document text
    • http://childrencareandliteracysociety.org/userfiles/files/wododixonimofoluli.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/91246aa87af0344fdfa36001e087ef26/pupozuxonejuwupi.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/webegebadif.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/88900675497.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99ab9b9cb---mirazifewimatufiwere.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/5541095137.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a63aee93aac---81196206021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=electromagnetic+field+nptel+pdfPDF 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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 17344 bytes
SHA-256: 85f64d73b0bd65f4f10471b19489af8af35a5f3165900021bd578600ec9605c1
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 10776 bytes
SHA-256: 5761ae197bf09e7905c34aa231ea2d5c46484d6c48ef53619edfa8448382e47d

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