Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9b83a0314db23e…

MALICIOUS

PDF

94.2 KB Created: 2021-09-17 10:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f90c35c24d4ac8930eb721cde7f12ca SHA-1: 8e4bb09987896578cd85d787d80cba73d75de121 SHA-256: 1d9b83a0314db23e8bf02952904a13860f2d6e92228a38fd10b5d21c393a1e2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on domains flagged as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest a lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • 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 http://dispensapertutti.com/userfiles/files/zofofusegevixubivinil.pdf
    • http://mothertheresapublicschool.com/userfiles/file/92279472470.pdf
    • https://zaragozadenoche.es/upload/files/58751222341.pdf
    • http://usaoxin.com/userfiles/2021-9/file/70709764454.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/nesosujavabi.pdf
    • http://drxzhang.com/userfiles/file/tufubazomodeveri.pdf
    • https://artedelvalle.cl/gal/files/file/1141669039.pdf
    • http://szentimresiklos.hu/upload/file/95982499884.pdf
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/xitanux.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59240164872.pdf
    • http://studiobonvino.com/userfiles/files/92547287630.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/50632558956.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d8046a1cac1c6ffc3bf7aa255a76a89/94574082369.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141efdb97b1a---73552648378.pdf
    • http://mama-care.com/UserFiles/file/muwosurugujuxuxepumikadod.pdf
    • http://medica-eg.com/userfiles/file/99533695518.pdf
    • http://batterseataxi.com/survey/userfiles/files/bonaro.pdf
    • https://hsse.cl/files/49649858663.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d2ddkjs1amhrp7ftnalishads1/38046203312.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/733716676.pdf
    • http://china-spec.ru/userfiles/file/37926824293.pdf
    • http://robedecreateur.com/img/files/bawajeverosinuma.pdf
    • http://wefocusdesign.com/upload/files/lujurubi.pdf
    • https://hantverkarenisandby.se/UserFiles/files/siwewalevutopedemur.pdf
    • https://dongcohonda.com/userfiles/file/pekatusarisidero.pdf
    • http://xn--eyt274i.com/upload/files/sikatulekanekod.pdf
    • http://needychild.org/ckfinder/userfiles/files/lefawusagijabaji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+money+game+george+goodman+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010748.bin
bd08ac3986a54d6846bad48054e1764eb8355983ae0a2895b7770d0298ba83b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 19480 bytes
font_01_sfnt_off00013a98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A98 16792 bytes
font_02_sfnt_off000152af.bin
4252c01fd1335276a2613a7be4f81e1b14fe9f6d5672642774615493db489d28
pdf-font-stream PDF embedded font (sfnt) at offset 0x152AF 10616 bytes