Malicious PDF — malware analysis report

Static analysis result for SHA-256 5555e72108b04033…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 04:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a305c27a93f908a61defe2fb4fbf375 SHA-1: f0a86b932c7554617f707a83cd75aee24cb9dfbe SHA-256: 5555e72108b0403353cf169ddfdfa03d208694ec75a2421e545d180657719f4a
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, including compromised WordPress upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://partnyor.az/userfiles/file/gitezurejakaxi.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/93ad695a2f545589140094391e32e049/48751630320.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b44617ea---2625426609.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/24744957297.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nefusolobifolojipasufo.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/zoduwesevavutubokemex.pdfIn PDF document text
    • http://one9five.com/userfiles/files/rerunewiritug.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210821_C891958775BDFC4A.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/21df00e3ec162c0820c3907f373acd9c/guvukosodelibopubaz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i7hnfkbml1755pbl06chmpuds5/90039363936.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/gusitobinunosu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92832c8ae62ad3819188cb93d17bfe3f/10352028930.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075246351892---47627824046.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa511cf53---dijuxisepezuvitefuvob.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9eb45d9a---sunegor.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160724d73950c8---180211324.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/xusijivifugogakekusunuvot.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/270qpov4msvfebfrf32ooc696l/54805592676.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7a599c74---16072577079.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zijuwodolujuzenux.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befa2714da1---pekevopevikif.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/92361049861.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/85438564175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=types+of+habitsPDF 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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 17816 bytes
SHA-256: a16809c32d4bc77d87b269ff93c4aee1fdcfa6e9857ca1f18be75306e55a0d93
font_01_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 10424 bytes
SHA-256: 78b73ee2ff95e6e1e332e5e79e5839a69d49272836ad64cfe58e1e165bdc4a11
font_02_sfnt_off00012edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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