Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a373c6f2b6a477f…

MALICIOUS

PDF

88.2 KB Created: 2021-08-15 23:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4f83706fcc5bd61dc9d9f62a3f4b22d SHA-1: 1bc79577e9be007ad07e5816c7f98600370cbbb7 SHA-256: 2a373c6f2b6a477fda1f67acd49fff17a44a6a2f6101feb933ed227b6b360c9e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or use SEO-redirects, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, as these rules often flag documents used for spam or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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 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.
  • 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://queure.ru/uplcv?utm_term=shawshank+redemption+tamil+dubbed+movie+download+in+isaimini PDF link annotation
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/109d6abd203f1b90b194a8b10a0fab7d/36279659531.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ppsp6vjosq08i5kujql3deopr5/kawawiv.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/zamobogokezelob.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7d44c132f351968db78916f0528f7243/63600127274.pdfIn PDF document text
    • http://www.centralperdana.com/file/lesodub.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/29a82ff17e1f091aaa315f3a0e87fe55/47045930002.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/jonubaxa.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210713_CD1BD331A1AFF48A.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/62482882740.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/8198449305.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210727_135034.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161089185c5ac6---luxunilimuwisilo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e1163d07b---79963082076.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8a10e2cc48cceb1ea5c4623853a2c527/83760532950.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/nigezota.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/39461941957.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/5344869522.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kozageruvobodutolovodazuv.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0pbkf2n6aatrjo27np0ubiimp6/72199172281.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/62523571664.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/midijusebeperojomasafu.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/20303539906.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e87b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE87B 20880 bytes
SHA-256: fa358bba1a9d3ffe9d71cba2dd0fa3513fb476da3f02f4c5a1d37bd599f08978
font_00_sfnt_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 17884 bytes
SHA-256: c1f3777d83034a02b0635d81da1f5a408ec9fbf93c2982a6e9d8c4751113c8fc
font_03_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 11216 bytes
SHA-256: 0328b919ddb70f30cf0304f6482f2f1112cf5ef7743f5b7ff70c1334f7580f38

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