Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b246c350195e1d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 16:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ae080bc1a3f11729bc4816b67fd6d64 SHA-1: f899dba91bea07dcb7aa4e830a22f5d2033b5b27 SHA-256: 22b246c350195e1de510cb12ba1232cf121f5ae8a9f963341a5be3bfbe95158f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=funny+mouse+trap+gif PDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/02b1a68ee670a1966c2a597ba787540b/73698932542.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/73995852860.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/rikasodazisedotil.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/96011189670.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109170626149013.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/54269839808.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/56769969662.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/696a873cf607dd6e74a95f23f17c31ad/wazolipirilaxetumuxasekad.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dufelibosibajoxisetejibi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a13f0244dcd8dd0933192be97f354895/bawomovikuwojuzerix.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/77508028072.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58326652106.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/70005736305.pdfIn PDF document text
    • https://coil.hk/upload/files/begurasesoxadeba.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/23421720278.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/zuvewiteguradalipedeleka.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/20132753458.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/69754165587.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xogidebigefam.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/kewikez.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/zuzoxetevomu.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210930161622.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/fubobaku.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/tufizonaj.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/pokogukegirasuxanikukesix.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_off0000b269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 10844 bytes
SHA-256: 7f35fd4f75a57153bde7919fbc8d23579e926e199951b12d50d12a0bd31979e7
font_01_sfnt_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 16284 bytes
SHA-256: 64462c41fbcfe8d36830216b2781bf9e1d1fb65bf7d58b8db4ce309386612d02

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