Malicious PDF — malware analysis report

Static analysis result for SHA-256 02343edf24b89300…

MALICIOUS

PDF

87.9 KB Created: 2021-10-13 09:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0303121a83072571f889a2b9cfe3a7fe SHA-1: 4dd3b4255d0360a5df70c0915505c4aa673e785f SHA-256: 02343edf24b893000238db14c5406b17a070d2fc3a4eb65ef684155c4de64688
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous external URLs, many hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of 'SE_LOLBIN_RUN_COMMAND' and 'PDF_SEO_DISPOSABLE_LINK_FARM' firings further supports the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://charmingcurls.se/upload/file/wakivamus.pdf In PDF document text
    • http://lidaoxc.com/upload/files/xabodimureje.pdfIn PDF document text
    • http://dytac.hk/userfiles/tozepuzapazekutiwezibi.pdfIn macro / runtime command snippet
    • http://01host.ru/userfiles/files/rewinem.pdfIn macro / runtime command snippet
    • http://packamate.com/userfiles/fumixowizazi.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/89087038380.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/86644462165.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5fcbf746e522e99a85bb1f2d7ad4f4d6/mejuvarusum.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/888a6784jedgsib8pk6snjat41/fogemitepijakumukuzuv.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/jolunoza.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/dizadamijokuwozelonop.pdfIn PDF document text
    • http://decaiyun.com/upload/file/211007070338861961o3egj86nyd0j.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/vawer.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/pibesipuxedi.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/56330577078.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/gofukesinopozala.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/401696486.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/xasijebawewi.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/81758362080.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210919211645.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/69215741015.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615871ef9c9c0---puzisuboda.pdfIn PDF document text
    • http://lidaoxc.com/uploadIn macro / runtime command snippet
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=trickle+down+theory+pdfPDF link annotation
    • 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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 20488 bytes
SHA-256: c9070b44b7c40133bb2ba24c97a66f61132d7aabaa5ebfd58f10f4993cf4f5b1
font_01_sfnt_off0001220d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A24 10644 bytes
SHA-256: c4884045061b784d5932bba6f10e4142dadd95bcbb43735d77086f08002cca61

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