Malicious PDF — malware analysis report

Static analysis result for SHA-256 731e07f611b85dbc…

MALICIOUS

PDF

530.8 KB Created: 2021-07-02 02:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: baa27d5766e3ebfd7909be8b6b7da6e2 SHA-1: 6230e77f25229bcebde654a1c4043326c05d2bab SHA-256: 731e07f611b85dbcbd1e9482875860a498f4ffbe368f980aa62d33bb7c3f4b7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories, suggesting a distribution point for malicious content. One prominent link directs to 'synerhu.ru' with a query parameter that mimics a search term, likely a lure to entice users to click. The ClamAV detection and ML classifier further indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6961

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.
  • 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://synerhu.ru/uplcv?utm_term=find+the+circumference+of+a+circle+of+radius+7cm PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607863457e659---namurowo.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/37760800003.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b34cbb2b0e3---bulezimu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9ba58b05---11084228965.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f66e989e6---jevajeni.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949184016b4---tidesuwa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c2532d9f846---37745272062.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/mufemopopaxib.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hd3ggr7vdlk3i2p4o4es6klcp3/68786209998.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210701_046695BA335E5AD5.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/87844054771.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3dc135b---71440271154.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da53da5a1f---41184878263.pdfIn PDF document text
    • http://4bx.pl/public/file/tanigerot.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d97f38557---zebesikaja.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce41cfdc6---bifowirosifuxotagugad.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66a65beed---64537635593.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/gevetevoxuwijekanudire.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca030bcd6c---donodogibumelusuwukowera.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zafavuxuvapegisefabixu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607665a6c82f3---86702383825.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffee16b816---9481658251.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/jefimejijamunubebojuj.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d3727f3ef453b78cc5422602fc3f1bbc/xuburir.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/wonufoburalejidew.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/bemuxagusakaw.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mawubowewugimegorodeboza.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56408e0392---muwobilobevovije.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0007c70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0007df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF25 10868 bytes
SHA-256: b366f2db1798f15c509ac63a477a18cbf75b070214ab57bc36b889fd5f605e03
font_02_sfnt_off0007f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F80C 20872 bytes
SHA-256: 0b63194aabf9299fe67e9a5d36560af2069ef2efa822712baca29e27b786d1df
font_03_sfnt_off00083000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83000 1780 bytes
SHA-256: 94da071d87cd7ee37ee961f4999d5c8ba7ea74871ed8c8102e48280920c52ce6

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