Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3ea71aaeb954ef…

MALICIOUS

PDF

80.4 KB Created: 2021-08-09 06:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: fcfed82068693b29e4d2f5382838dcf9 SHA-1: 3110103446222717cff8621c2f35e9aacd186266 SHA-256: 9b3ea71aaeb954efd48510a7d1787d3cabb06e9f5407d03d03007c05ee72c8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The document's structure and embedded URLs indicate an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=daikin+vrv+3+inverter+service+manual PDF link annotation
    • http://residencecarlofelice.com/userfiles/files/nawinadakobolaren.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210530_BB7469D9D2F2FA7C.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/39105041379.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/42j4kqsbvro02djt190lm2pmn4/tujosodado.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f545c7a84---91009918877.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/50154518089.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9643dab8---xefofufotuvotuja.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5a66f33c0---zoxuno.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2ef67b526964d95f705a9256c7bec98e/manajimawumetubali.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d67de81ff---finukakibejuwerejixoguz.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4da0342c---jufewukoginuf.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7c13cd17aa701edae79cf5384431d984/86891668203.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1769b158ko0pjild4k2c89f0s2/moguripux.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/57061185171.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/54437d7fe62829bb512a264efa7475f4/77887499541.pdfIn PDF document text
    • http://terminsk.by/pics/files/61447286652.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xoweguxa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610062c30d01a---90294937824.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1cb426f10---58713891140.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7e0963375cd69d0b92fdb3d6bdf66c1c/36373155058.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/82228506740.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/devadutefisifi.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/75943572105.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/51l6ke5p27hfi454ad1ra7vi63/wemarukivosegerubun.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/56445645980.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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10700 bytes
SHA-256: 6b29a72ffd6b6ee3f66bad48ed27d64648316ad09e32389912631f73db44cc14
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16560 bytes
SHA-256: ab5a4a25bce3527acfbf7a19a98b4d2732ac39e821f43a1f73fbf56cd28eba9a

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