Malicious PDF — malware analysis report

Static analysis result for SHA-256 e985d88403951c79…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 12:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2390b1a848753f29e8d9d134e4172901 SHA-1: c430d17dff0b0f2b66510e144130ed3143b14000 SHA-256: e985d88403951c7911239cff84938277b22a5eac46e2db262322ddd96a82f56a
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links, several of which point to compromised CMS uploads or IP addresses, indicating a malicious intent to redirect users to malicious content. The ML classifier and ClamAV detection strongly support this assessment, flagging the file as a phishing trojan. The presence of a download button further reinforces the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 10

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hoaisonland.vn/upload/files/rinoposenusefojelezipepi.pdf In PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/darobimijakenufaletotev.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/sepirixenifelazabo.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/welufazaxanul.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb7e87a27---14504865547.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/36989776730.pdfPDF link annotation
    • https://h1t-urlaurora1-turbo.com/contents/files/53832426115.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358ac91df84---89803115665.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/23710894706.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/10467189648.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/80916602772.pdfIn PDF document text
    • http://spiregene.com/image/files/20210912_025006.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141235880085---67310445561.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/28303809986.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/75205120096.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/diterosam.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/81159027674.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/3442743020.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066438f50e---54200840652.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/joxikajofupunafin.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/43714447729.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/69071462051.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1c5894b0---bipajumadujaze.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/sutuxekurasazekakexanafid.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/44027177312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=365+login+loginPDF 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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10000 bytes
SHA-256: 99647eb6fee9588a366f116ffcb3782ae1097ee835302b7a3f51753371090993
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 18492 bytes
SHA-256: 15a555c4a9f21f1e09745b4541a9c84b79ec558477dff0610e6997bd5fb0a783

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