Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5f0f9a1a2b873d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 00:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6849f7b821e33870e2b367acf7393700 SHA-1: 91a91cce3e93d049f4436c17b4c4889655ac7bf5 SHA-256: 5b5f0f9a1a2b873dca20c5420a59c60a8636a8c22cd29cc031697ff1873d9acc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=comment+arr%C3%AAter+de+procrastiner+pdf PDF link annotation
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/dodevo.pdfIn PDF document text
    • http://sam-global.info/files/file/5653082441.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9c7bc5db638913e5d54c0ce2ffafb49d/mugavuvedilinerokini.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5249321c3d7da2ebbbf82e70445e543a/kunodaragejepenowedivul.pdfIn PDF document text
    • http://e-sportis.com/images/upload/90578424671.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf522b902---36412112933.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/76194940320.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/zuzefuzixedakixe.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/fenesakinebumemuratiko.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/59878083171.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/rezowoku.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43feb516---banobegebevekoruboj.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zafov.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee3e9b53a1ac251330c9e776fbc90506/tenufenoxapotixa.pdfIn PDF document text
    • http://yuha.be/_files/file/nomununetodebutudo.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/72285450354.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/vamubibekuduzajof.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0ceefe3632212d8386e82728095e1f11/95518840159.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/65351637957.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb26e2608---68519165720.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/kebekexolilibez.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/jidixadafidegazuluvan.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af26d3609---60689900531.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fuzabarowemaxopugaje.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2060d6ad98---59359498858.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/37769274897.pdfIn PDF document text
    • 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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 19656 bytes
SHA-256: de4610b11ee85c9f4941354ba05260846ed577118352b900b305e7f0cf71504c
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 10924 bytes
SHA-256: 8c81aca7a77a1552605ae5a8d4e75626ab07412e5f3af9ec5094dbf0481f7f9e

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