Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c582f70f46905c1…

MALICIOUS

PDF

90.7 KB Created: 2021-09-14 04:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42afe4f97a21912ebec25cf286c9ea10 SHA-1: 625a5b25b4b581c82852d8ea49a27ff6a0fa0128 SHA-256: 9c582f70f46905c145b7ffdb907fde3ee3ecbfbc98c4d9affcd64bc3b1a2195c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at driving traffic to specific offers or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://coretry.ru/uplcv?utm_term=fire+tv+stick+lite+play+store PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a0c1cf10---kowufumajax.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/88593203770.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/25893302486.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/nelazodupefirigugo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b616ff5e16f0af700bde20309cb5b5b4/97341416349.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109020943148539.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/31060036236.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/69673201e9bdb9eb0b57f36a022dbb6c/41279206407.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/rolefizukenakudasutupope.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f231dc143---33809587895.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xulakogomawafojexezikinam.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/17222792118.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a210037bfe20731709b1b752da81c9a4/10359150881.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/kategev.pdfIn PDF document text
    • http://charivne.info/images/file/pixolufege.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/86129712203.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/45540268877.pdfIn PDF document text
    • http://momsystem.ru/public/file/15895350342.pdfIn PDF document text
    • https://sadex.pl/fck/file/45555648243.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210911_5D21D21F0B8CAE54.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613067ea9dabd---93716971468.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312bd003032---debapetowome.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/jaxani.pdfIn PDF document text
    • https://binhvi.com/upload/files/fizoriwimuzupamu.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/lojaveneladunon.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/xiboxevi.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_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 10512 bytes
SHA-256: 48d9b6783c81dbaf8abc50067fbb92de46563509f3b783ed0b9ef8df354d9247
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 17796 bytes
SHA-256: c9eab92d4020d0b838c18924c50e4246b6eb2723b1d4ab176bc3e6240a1b184d

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