Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d077c025d54986…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 09:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e89c6f4d0d5b14d21ad9314c1e3a4af2 SHA-1: 6ea91a172e43994c107228afe7d3b25ce5e0cd0a SHA-256: c6d077c025d549864edc5ea91eceaa7607f87ffffb8920fafa99c1612cefe1e6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'cmd.com/data/files/' in the document text further supports the execution of commands to download and potentially execute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=zarchiver+donate+apk+download+free PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c08a9bb6b---57536922278.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/27483059766.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/81229070338.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904124535785164.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/ledokemezi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5ets9kelafuolsspt5livi6ld1/62424980910.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9639d3fcd---benafosiponexaxajaf.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/befuzovekoberalob.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/56514262100.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ecb49da1---puregevalo.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///28267487085.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/19760431987.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/talarad.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/74264013591.pdfIn PDF document text
    • http://markone-tools.com/upload/files/fixipokipasan.pdfIn PDF document text
    • http://a899.net/userfiles/file/nujamikinawe.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mamiduniwikexusowin.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/rerav.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/nujurovi.pdfIn PDF document text
    • http://qdcmd.com/data/files/buwiwidedibozizigalu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/navumarorasazujonuki.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pivamobiminuta.pdfIn macro / runtime command snippet
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/nugobebasaboki.pdfIn PDF document text
    • https://dmitrovkIn 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 18728 bytes
SHA-256: 44d68cb547951d9bd4c7a5f48942793879dd3f46f2525908f50ed972087a722a
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 10756 bytes
SHA-256: 07e4b7f5005912981a78ffb0ab24a24db157fe8e04b28399ed069d708d3e58c3

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