Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d21f35c7e7abd6…

MALICIOUS

PDF

78.1 KB Created: 2021-06-25 14:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80e970b5e01391da8f090552d6094891 SHA-1: 357b5d6dc22113779a5f62e1b80f12990a5b1745 SHA-256: 66d21f35c7e7abd65a2632454ea86ef6f167440c4045cb8a5638690e7cbc86eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous extracted URLs suggest a tactic of overwhelming the user with links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://slhs1958.com/clients/18590/File/nuvopagor.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/jufipejonibakipapeko.pdf
    • https://aedwea.com/upload/foto/80551744763.pdf
    • http://angelcabrera.com/FCKfiles/file/1025772486.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/859bd710f38ff5fe8b39e6f70ea3c086/fujifodifunipakizif.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mdq1ocbven8hcnt4jqvq56ougg/82212287228.pdf
    • http://geologocarmignani.com/userfiles/files/40166852305.pdf
    • http://csc021.com/userfiles/file/20210620220549_12mn4d.pdf
    • http://beateromer.com/bilder/file/detokuporuke.pdf
    • http://allycatering.com/userfiles/ratukujepap.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/443b00aa7393470ef0e7d7ed00087f4b/wavakajoxuzaz.pdf
    • https://rmp-traueranzeigen.de/cms/files/83874317806.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f36240abd---87298527344.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3556b3a281158ef27c755a4848940e13/pikigamexet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=complete+biology+for+cambridge+secondary+1+student+book+pdf+free+download
    • 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_off0000ca52.bin
769fdd34f84b746efb2816e8fbc7a8ee41bef30d44f091e99b27d4c4fd382beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 11580 bytes
font_01_sfnt_off0000e588.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
font_02_sfnt_off0000fd9a.bin
e81e4ebd9ee4d727425e7ba7eb527ce46f64dba838850459062296ab1f64dc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 17556 bytes

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