Malicious PDF — malware analysis report

Static analysis result for SHA-256 d367707624fa137e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 22:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec5cecd9ef0375d5e95988029e036bba SHA-1: 59663a0b4de0c267b35cebc7cdc65977aa78e033 SHA-256: d367707624fa137e49ae10939c1209c3911c18c7061d0b54e54245572263d053
216 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'cmd.com' in the document text, alongside the callback lure heuristic, indicates an attempt to trick users into executing commands or contacting malicious actors, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=ai+and+machine+learning+pdf PDF link annotation
    • http://deborahkay.com/ckfinder/userfiles/files/80705367572.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/45995357797.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/nurusitufivasajaxupawotax.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd339b0503---6885096286.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/bododivos.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/vomegime.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/35626462282.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/gonosoziwaxedudorefibenul.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/54217800128.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/69053049239.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/47547344612.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/kojasiduzosibivawewobuwi.pdfIn PDF document text
    • http://qdcmd.com/data/files/4957026678.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/20211845779.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/fozadugevenopigux.pdfIn macro / runtime command snippet
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c42faa4b4---sudusivunaduwaxiru.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/98120832375.pdfIn PDF document text
    • http://kelvista.lt/images/files/lalologozirogeburevimok.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c75b05aa86768f95c9b1e13086412e4f/27601735641.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/wifibenerakokedupa.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/suvusawitovofuvoniruze.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021092221335473499.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/vonali.pdfIn PDF document text
    • http://www.parinet.fi/tiedIn 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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 15840 bytes
SHA-256: da4b0daf58474530ed64a2a500a6351d92dfb5f232e04ce45c174f066d4063c5
font_01_sfnt_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 10664 bytes
SHA-256: c385725f6767be53100598f01700d6a21273227a2e796fe9b72802e2b6afdfb7
font_02_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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