Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb380096eb80e87…

MALICIOUS

PDF

89.5 KB Created: 2021-07-27 04:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5a1971b0bd58075ce4366382fe2f77b4 SHA-1: 1ca6510d8d15158c16cc0eab8777fbee7189482f SHA-256: ffb380096eb80e87906feb50b177a46fd81c501b877d8c2a7369e8bbd66192ca
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, likely intended to host and distribute further malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9834eda4c4---27123077278.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/51l5hku7k2sreo6ivpv1auknf2/beviwajotuzexeposijisa.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/61119672330.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a5pjagfg2r8jvlup7iasd4sba7/11678427383.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/mexofarafozibeb.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/57750872249.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/fesuwo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8bacf280a---85056282957.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1838aa4601cf99b00026500c6a9dc033/fizowof.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eb8165cdb---risunodokigujerofidokagap.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/18995684819.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mebipodovato.pdfIn PDF document text
    • http://clarasonic.com/upload/file/1669223953.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/jufolobusakesuligesid.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/fapejinebozatuxusum.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wavetexivepuvavo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wurekolamuromipizozovi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160908d08e1327---tepegit.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/84208584625.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/92141288940.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/xikolaz.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/lrgvgkd30aopcs9uel96qeo143/56323589849.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/67197701405.pdfIn PDF document text
    • http://519pf.com/userfiles/files/57682259492.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/u291q4j9llda2k25gdt80ioova/53004358930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ejercicios+de+progresiones+aritm%C3%A9ticas+resueltos+paso+a+pasoPDF link annotation
    • 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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 19352 bytes
SHA-256: ece5cdab207227a02de630d8fc8d16c98d7314c245feca577c2c53ed7a3501db
font_01_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 11224 bytes
SHA-256: 9796c24aed33314d1567c8f76e3bb81aa90f4c82cda6e8ee6c15bd345f3f3e67

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