Malicious PDF — malware analysis report

Static analysis result for SHA-256 558db23b165c9985…

MALICIOUS

PDF

91.8 KB Created: 2021-07-14 05:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb07f411672406c7f93b7428417d9d17 SHA-1: aa5e6e9c9205670dd9c5c292277a7245925d930c SHA-256: 558db23b165c9985eb6598d6a57267a7f7636f918ea3a7a7d751645b05d97562
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=difference+between+iphone+7+and+7+plus PDF link annotation
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837629ec5c9---68255233653.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f3f54fe4a8a5cae7c930a7c5ffc43429/ropamika.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/21082166005.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jemusivitebirijim.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/68770156604.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a778fa7df6b---82648997777.pdfPDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ote3uifnj8g0c4tg0liasn04ng/6159622963.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/kajazenatigu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/f0asiqvavujjkbf1pccclad7pe/duwibapalizozebidal.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/72845069057.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/27489273536.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/56707602176.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/046083d7ad1912f5f7e2a0844228c870/limalij.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/95556458388.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/65059403224.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7f8c7fef73241a49db8867037789a6e3/nerepana.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a177f285321dab9f50b354a3d63b8950/73986573228.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/fegabilabezekoxodiwe.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19bb0964b3efd801d7fdcc1472f455a6/losuwiburudiledut.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xowolobaredigurew.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e468abc3---46094640592.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/femesasas.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ed5691e9f---febotubugu.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_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 17392 bytes
SHA-256: 806179b2fba249bb5d02ff9abc1eba637b54ab9eafa33be4b84ab789b9cb9abb
font_01_sfnt_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14640 11092 bytes
SHA-256: cd221b7c001c6b232684ef47c7c5936fc2d086fb694d29aabf9da3db7bbda46a

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