Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f7aba5b1e6c299…

MALICIOUS

PDF

81.0 KB Created: 2021-08-09 09:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7faa9cd9305427f299f2032e976e88e9 SHA-1: 8ed3fcd361b9a4c7fa962526061ec0973035c995 SHA-256: 88f7aba5b1e6c2994633415a2755cc0ace60b62ed9797a1f157edbbad12cd454
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple links pointing to potentially compromised CMS upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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://airholic.com/UpFiles/WebEditorFiles/file/77183223712.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/jumaxu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ae257eb4---xexajotovekovijawimamiv.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1f206bca---81273482746.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/82205592686.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/73981516538.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kenupesijidone.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/anrhmest6m0iad2m9osegjq9hl/85553251836.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/47009497084.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/316dd018bc54ba3d647311ef65c3a0a8/ramexegobawatel.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d09e57eeb---82252530275.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a788d248659---natejuz.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/50144635802.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42a0bf3773---62854927159.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/goxoxilowabatuvuzub.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/dixakoputojajorevujem.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/ponolixaribefu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16100d22007aa7---fezegezizemodibesarelakox.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/37249767042.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/34635805660d2a3d594b27.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/12333959987.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tbdv7j1rsfgrdbg5p4ncjnfgk0/85737496385.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jonamamusikipukisitusomo.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/finikibewerivimijafureve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=star+wars+imperial+march+mp3+320kbps+downloadPDF 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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 17988 bytes
SHA-256: 9dd5d6cb49e638f1c223c2caaf81eaab815821581b3debd3b48975a78b0e4081
font_02_sfnt_off00011a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 11584 bytes
SHA-256: 377274cdd4a7f82bf97574b9f29e646d08f5e1b8b68ab89f52f2e92b2ca7dd17

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