Malicious PDF — malware analysis report

Static analysis result for SHA-256 771dbe1ef9d50f56…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 10:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0adacf096655fd9ae1f1a64711b5bb7 SHA-1: 75087714fc94dd649a443065da7c8594d5afcc5f SHA-256: 771dbe1ef9d50f563bedbad4f85e611a9d0bbd81e09e4236ef46236c4d8c7b1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests tracking or campaign-specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://queure.ru/uplcv?utm_term=evertale+mod+menu+apk PDF link annotation
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/fadufunitale.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/zepesoluvupipozudeta.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/girazadefir.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/53076655090.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/58668792011.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/purarex.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e508e48389adf156c68e3249c0bd8ff9/xebozejuna.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xexojiser.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/10193257090.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70ddc7deb---nuliwesonowefijegixo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/44756a737e3bb996a57b1469180d7c9b/norotewovusijiwuvemowares.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebee56a284---sabezajemanetojigame.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/femewo.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/45907343865.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/79252403555.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/xavefodagikulaj.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/59062731623.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/48165792005.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/ratezupotoxuwijetut.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/10be6878527209dc4d9627a6b76d0269/juxibezexunapezikemojef.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25370213222.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/86083bc28f4cfba00548d94dbd2a0ea2/vuxezakupegaz.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_off0000b99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 16904 bytes
SHA-256: b8cc7d9ae545e0c760bd0d63b5167c1f3be6e72961a9906adcfb2f44ce3bee40
font_02_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 10536 bytes
SHA-256: 007d7dba7ee986e4a222044ee80264b16807c4b42251cb5a5f2f78cecf83da3b

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