Malicious PDF — malware analysis report

Static analysis result for SHA-256 888642408657fc84…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 10:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b21d2985c372184979e42b37eee78f9 SHA-1: 58b313b8ad0fffedd6d08282279302a1132c2435 SHA-256: 888642408657fc84a7dbbf0cb244ad22eb37b60575feaeb710c277c192157ecf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs pointing to websites that appear to be compromised WordPress installations. The heuristic findings indicate it functions as a link farm, potentially for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://pistant.ru/uplcv?utm_term=curse+gaming+classic+wow PDF link annotation
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5fc77121---tosepironidodubovup.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee6bd405b---jotil.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/fisazutowilit.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/86133620945.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160833d764af9f---tabuveli.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/30543212811.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fed9f0c251---jefavubezukivezuwijul.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/jafewelezawozukovotedisow.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/s18evuuk14vor2p78pbriievcm/21323798250.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497ae420ac---xumeje.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b3c2b823---95767612086.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tiqka0phelmio32s209o54h3i2/wudotareforibo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160943ad23d5c2---57831172243.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4dd655997---numefigovokaxugekewini.pdfPDF link annotation
    • http://sanphamhanquocymy.com/uploads/files/4819019479.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f9d935adb---5161100490.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/94792144467.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/90703373146.pdfIn PDF document text
    • https://tepihtrava.rs//files/3966754641.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/ganipiwovi.pdfIn PDF document text
    • https://aneri12.cz/res/file/88375053827.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/libasaxobalokuxokesifugak.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/fanafesoximivizisegomiw.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/daterem.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b0cdb133ee1297100530d9218f447cb7/wudokozelob.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 17368 bytes
SHA-256: 29a6d326a20f728dc7c0b5e2fd7905f8db51b795141eb0c9d0d508159aa29809
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 10692 bytes
SHA-256: 0449371e0750e079f4d9ffc5c4f4a293a5c7fb1c1f0c3a6bf8bec2cee5140d51