Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcc3ac4b030cb3b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 23:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ce745702ccf697edf9ebba865ee14a6 SHA-1: 0e3f380e9c3b94a0bedbb0a9963f1cd1f3fb94b2 SHA-256: afcc3ac4b030cb3bfea41111483f3a3e173e165c014cc3c7a54d29ca951a55dd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of 'wkhtmltopdf' in the metadata indicates it was likely generated by a tool, not a legitimate document authoring application. The numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly indicate the primary purpose is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://ketchas.ru/uplcv?utm_term=mlp+on+android PDF link annotation
    • https://idd.no/ckfinder/userfiles/files/nazudasejib.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/22929657438.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/7018272189.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jofebijulajomupow.pdfIn PDF document text
    • http://artediapharma.com/upload/files/mazapofumigiripelobobom.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/luvidozogegi.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/bisazumevu.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/nanabiruga.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/50246720787.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613986210b177---ketulesakuzekuzebaworumab.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/daxinulodaduniwetubes.pdfIn PDF document text
    • http://hiniceshine.com/upload/65151511786.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/16826241390.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/42281612348.pdfIn PDF document text
    • http://mutitar.com/user_img/files/76029012640.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/wezafadewolamabivurumij.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/tigegozosugakunigawarel.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a067a4e7bc---59839581317.pdfIn PDF document text
    • https://actorconseil.com/files/file/limuw.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/detodebefenunakivotimuz.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/jixixitujox.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lododibiladuvupa.pdfIn macro / runtime command snippet
    • https://jagamimpi.info/contents/files/zaponosaniwezudigupofiv.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bc51213ac0d0c2af5019d871a004567a/71051079962.pdfIn PDF document text
    • http://klenderbio.com/upload/files/69413592582.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/44806508173.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_off0000bc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7E 16248 bytes
SHA-256: 555a52cbbbf6ff0b4f0b4ed40b7b94a5875b05de12086c66dcc10e560ef94db3
font_01_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 9980 bytes
SHA-256: d7463a5726c5588cf3ed1dba4b91eb277d622339832f40dec302913c29abdd09
font_02_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.