Malicious PDF — malware analysis report

Static analysis result for SHA-256 badda3b37b1432df…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 13:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6480c920295f531cb36f480da84ac06 SHA-1: 9a7e92a76d5eea6a3c6832917af046c4223abc06 SHA-256: badda3b37b1432dfbf4d46fc95ff014f6f25f7047e92b6860ba1d2431e06f883
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://crewmak.ru/uplcv?utm_term=catalytic+converter+recycling+center+near+me PDF link annotation
    • https://zhansq.cn/upload/file/seguzoditu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/27112532921.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/104e20536cb764b23bec6dfe04d2a2f6/zitidoz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789339b185---lebemapiril.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095816f2ae0c---74998240317.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gfq6306lp6b7r6usquboc7bo32/10382139917.pdfIn PDF document text
    • https://emprenderem.cl/files/lezaranexivugibumizuf.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/974858304.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/xomotiforevidu.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/16517861365.pdfIn macro / runtime command snippet
    • http://ihdbd.org/upload/files/52395090236.pdfIn macro / runtime command snippet
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1cc3c174b---75867280836.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/62453537375.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/33605713043.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/43413a356ec66426f7fc2edf9324e344/98040061334.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f6a0d31c---juxigafax.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/14002802986.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3b18c5bb52f4bf6a00a6cac8d0840229/1289984688.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc8486e29---dudurojodim.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/jodavezuza.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/13287472524.pdfIn PDF document text
    • http://windowsplusllc.comIn macro / runtime command snippet
    • 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_off0000c122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC122 10616 bytes
SHA-256: 326fe782ee211c63793497a3ac90465cb801cf870b964bf2f0d91a9fe792adfa
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 15988 bytes
SHA-256: 71640ce9d9e0578a55e4cc9ccaa686bc5d6678a5858d0c98a6c227db0dcb1dc2

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