Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92a89cbcc1436f4…

MALICIOUS

PDF

76.9 KB Created: 2021-07-03 00:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 340b7b9284d6a22a139723566cda0afb SHA-1: 3afcc87bbc2c8b1237354e4cccbb2cd1293b6077 SHA-256: b92a89cbcc1436f46758e939e962f689e3d09e37dea580875e662c1a5fb532bc
156 Risk Score

Malware Insights

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

This PDF file contains a large number of links, many of which point to websites hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://newabel.com/ckfinder/userfiles/files/pafugesisesuraxaniw.pdf
    • http://amon-syotengai.com/userfiles/file/fidosew.pdf
    • http://brmhn.com/userfiles/file/20210623194140_ubgabe.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0021a77ec---66462724955.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8acdb52568---75976784742.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a45e1d614---84138090306.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d304c95e---57688061543.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/8b0e3ec71a98cf287e9217d3ab75305f/11042529671.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088860e7991a---17634825046.pdf
    • https://victorybear-info.com/userfiles/files/rigeni.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91a91971b7---24344574641.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b01fc4981---70378422841.pdf
    • http://sowitech.vn/upload/files/19365141.pdf
    • http://ubestsports.com/imager/files/20210606101147.pdf
    • https://traffictkt.com/viking1/uploads/files/tuwusosizuwuvuf.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/munodijowudokanatumavase.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4c6fec77a---xamonagabizogasi.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/42c633386412e215fca86d8b3e430549/bamizebebedanifak.pdf
    • https://accuratesearch.com/userfiles/file/5461975276.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a398c536e04---megog.pdf
    • http://ilksolar.com/Images/Media/files/5373372948.pdf
    • http://al-bandak.com/userfiles/file/78766877087.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b57ce2bf---xiguge.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=grammar+and+vocabulary+for+first+certificate+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_off0000ca69.bin
a2612381371ddea95d653915cd467532b8fdab6d6b030ac886260dd12ef5f1fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 11240 bytes
font_01_sfnt_off0000e493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 16792 bytes
font_02_sfnt_off0000fca5.bin
a105ceda7670be4ed18c805e5007303b14ffa02538ce807eca7a395e8132f398
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 16288 bytes