Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0297c97ec180de…

MALICIOUS

PDF

77.5 KB Created: 2021-08-13 06:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71cf29e860c60b6a7e4d2d5834a3fe69 SHA-1: ec01ad0318b255e92d127fd79a31bd2b26926841 SHA-256: da0297c97ec180de14af61505897693e854650e471e9091bf39aef7413e42b67
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, several of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://clinicscrm.com/img/files/togojeg.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/judr8nqlpn1m1die1rcdf3anc0/75023417742.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/fujofireziwikamibufexujud.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a4896f6ff122a3e99cb7dc485d443ef8/vuzigexazizoren.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c27ec58e77fd00f2dc0ea5e75d77aabf/jebarotujubugukogufan.pdf
    • https://activepymes.com/pub/file/4345586279.pdf
    • http://mikailang.net/userfiles/file/20210523131951_1890441186.pdf
    • http://grawerlik.pl/userfiles/file/geritinogasidelenomubaxi.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf1b3cd76---sotukizabenumabadomu.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cs0fjs047fc3dmc3q6fbdu0lgq/jadixami.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/wuxawarafivib.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1481b1de379d7b171cd53c8f1476b104/69315285854.pdf
    • https://quatden.vn/webroot/img/files/21525863716.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91655107b---jiwuwosajaveg.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60366337c---vodabajaxusarujila.pdf
    • https://candbco.com/ckfinder/userfiles/files/lifipagenafa.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ci62fa24ei0s1smksj0h65ao85/2070944979.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/tukunatenasipomeniluweveg.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9ce93cfab51e1f9f1d21023f68a78579/13817403415.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/dizekiwomisi.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/17703639250.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161159f6174964---mezuzuvuj.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/26392889571.pdf
    • http://lineshare.net/upload/files/20210728022029.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3998nl4tpd7fbnomvtsajofdge/72240881982.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+bypass+parking+brake+wire+on+aftermarket+radio
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca3f.bin
9583e08d0e10c6859bdb6308b6089e00d6ebf18f15588f09900783221e802bb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 11220 bytes
font_01_sfnt_off0000e42b.bin
a128c26c585ab3c48cafa3b29e1ee9b082b2ceb4925419778a0d068829492649
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 16500 bytes
font_02_sfnt_off00010eb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 16792 bytes