Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6a182f25929414…

MALICIOUS

PDF

68.4 KB Created: 2021-09-18 15:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 819454401b9f39b1a06fd4062fa17db0 SHA-1: f99a8d7a9d922a01f83177af683e31b0cd50cc00 SHA-256: 7b6a182f25929414c816d70d18a3dc5f753de45417694b100f696e00a9018cb7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and ClamAV, indicating it is likely a phishing lure. The PDF_IMAGE_LURE heuristic suggests it presents as an image to hide a clickable link, which is a common tactic for directing users to malicious websites. The embedded URLs point to various domains, some of which appear to be compromised WordPress sites, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=how+to+know+if+your+mobile+number+is+hacked PDF link annotation
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/34572773988.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/50918075533.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5ba2725c---51890095231.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210906231108.pdfIn PDF document text
    • http://caythuocnam.org/images/files/gopulawa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16142a26c31502---dalituni.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/tozis.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13304519410.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/34522998275.pdfIn PDF document text
    • http://itena.si/uporabnik/file/pagapifomisawakerukagur.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/63360351366.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/jexegav.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/vivegubeguwisa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f11121a9b---59826357627.pdfIn PDF document text
    • http://kme-kme.cz/files/file/99070868132.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/sedebemudizi.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/fesumaxubir.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/49173510781.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913023056.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/4156076771.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/79885938175.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/najalulapi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejhljickgm18labkcs1mslasgf/23578239480.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xusubumebi.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/zupalejapexopid.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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 13820 bytes
SHA-256: 9497b2ebee0e98572588898a7deb6326c8d408e685f1361a7a7ebdd8271c82d6
font_02_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 11264 bytes
SHA-256: a948237d1ad8d4b3ad7d6a81f652b5678d4d9652715dd3fae06c4cd881cbf8df

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