Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea71035908634460…

MALICIOUS

PDF

88.4 KB Created: 2021-08-20 07:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7106151768babe52f0d5870ccbba08b0 SHA-1: 28a78e9b71cabef7425e1258f50a6242a780ced6 SHA-256: ea71035908634460fe7faaf3b842720c45523615b32e38c976be5030c51f1156
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crewmak.ru/uplcv?utm_term=ditch+witch+rt45+service+manual PDF link annotation
    • http://svsteinfurth.de/radsportfiles/file/10936981480.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/93521930749.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/rafolevamebip.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/26958683545.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/zuxoxawu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wavuko.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/kiwuni.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/xewadedo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ab9dde28---20765201150.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/gujuwozenozajajizagebuv.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/fokoxi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a1042bbc9---31852804086.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/46092066096.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/48210538070.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67e2b9514---gadodosajadaje.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160833382a58e1---lototigifeno.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/pojunajoxubomazifaziliru.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/33092012696.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/30015626684.pdfIn PDF document text
    • http://domplus.su/userfiles/files/tuvuzoxepotexiwoda.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/64286839415.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/puwodivesoguvodevewetegu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/rexivudin.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/vabolapatuvileb.pdfIn PDF document text
    • 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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10840 bytes
SHA-256: 19e24a923b8bffc2a10a520f790b2cd43bf151cfe492b8ca1cf36a0c7fab3e40
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 17968 bytes
SHA-256: 61e04ef12de43259a34577a822806c9b1557a50d5fffe597031fd37df1fbff9d
font_02_sfnt_off00013b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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