Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b70181b7f4cb210…

MALICIOUS

PDF

76.3 KB Created: 2021-09-28 16:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01a1aa045c106c8eef2b78e93a3ec968 SHA-1: 2ab3ac50a7ab57f6e1c864ccd9647b73f42a70cf SHA-256: 1b70181b7f4cb2105fbd388148bc7da7f9f40f26843cb500b2a5c2d30cb6b215
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://pixomot.ru/uplcv?utm_term=cheat+last+day+on+earth+ios PDF link annotation
    • https://restaurant-kamkok.fr/img/Data/file/sebofezaweninakoluzirelo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/udpfh4es89sope8oe932mb9ta4/lokuxuzipitowadefugup.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/48557602152.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/4724905276.pdfIn PDF document text
    • https://egf.tw/test2/images/file/dokujupadixikekugirup.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1eaf66f26---41299785476.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/795744884.pdfIn PDF document text
    • http://client.diffuse.info/files/xilibenuve.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5415d452a---pamiginuvo.pdfIn PDF document text
    • http://dasbluemchen.com/ziwidimebujigubokedo.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/88769071188.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343d9841540---68562692584.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/xesovatepezatun.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc0e936fd9---61826286013.pdfIn PDF document text
    • https://davnosti.ru/upload/29613312056.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/5629684349.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/dapokasibanovugufopog.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/olktbd8u4n1eom3giftdn3t0tu/29918892443.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nutumowubivawezopemetu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b32db076c0---legapudepazomasekepen.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/2864506108.pdfIn PDF document text
    • http://temple.mo/userfiles/file/65589405917.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/56825187834.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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 18376 bytes
SHA-256: aa2a72f8b32c134f074eb756d1d75c7963d5023284746bb6d0c14a8c9cbaa634
font_02_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 10488 bytes
SHA-256: aeecf6e98a8e4b76a84de685387da3de60b825ddde3a12e16cffafa7eb0a8e23