Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6732af4a4c37e92…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 10:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 076d6cd78d8470a2af0e86d3109f4e37 SHA-1: 18906887582abd166f2922e55d729ebb86d51bf8 SHA-256: d6732af4a4c37e924c5e7763c661a54ce35cae03a85890fea393515e17f1897f
124 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on compromised or disposable domains. The ClamAV detection and heuristic firings indicate this is a phishing or trojan distribution attempt. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather as a vehicle for these malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • 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
  • 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://steklo-shik.ru/userfiles/file/88262883644.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/51231828576.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/91008157073.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/sojovumuganik.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/84287737330.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/89918300678.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e736a1914---xojijuxotatomozulidipojen.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982fad06e65---perenejal.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/87112984956.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/67972099653.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/korujemasovinamikixulugo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f50dd45f---25134203107.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/309d16c3490e4d89c59366af635f2f4c/vaxigepesakidexexonufu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d66a6a2e---lojov.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9beb8bb58b---31667833571.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/70406109075.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/dinemilojibulezej.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dh5o9j07pddv1t26lo8g1amudj/27774022256.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/59031aae350a605fdbf120193a603213/67844425281.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/16961765383.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/vokewesun.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/21487162529.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/zivusejaroxaxepaneke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+first+modern+atomic+theory+proposed+byPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 18504 bytes
SHA-256: fd5a0b9729710a6cf650e995e1010b4fe2d8cbd997a484a7368e0cb574de0f58

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