Malicious PDF — malware analysis report

Static analysis result for SHA-256 c686952c80233f64…

MALICIOUS

PDF

96.0 KB Created: 2021-08-12 21:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b5a7872d635ffe4e1d3b3d286068dbe SHA-1: f0096dae0f63a75f916642e6516e3d5f4dd36191 SHA-256: c686952c80233f6425f41f95d27865591e3437c083bf6a424004674b63c31c8b
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. These links are likely intended to lure users into downloading malicious files, such as cracked software, as suggested by the 'utm_term' parameter in one of the URLs. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b019bda41f8---vaniselomibixafut.pdf In PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/soterolibaniduritepob.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/runawor.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fae39d1ab---26787711824.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/2784225075.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/nvluakplfdtfb7kdinhpq24iki/tulomatadapabegi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a349505d8---resanisosudulexutejamuwar.pdfIn PDF document text
    • http://usateatop.com/_upload/files/33926139846.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/sobojiguvewegukebuti.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/nisupapeputusopuzokakixol.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa57b3a8323---luvogafewuvi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160816b6fe3bee---fowuxufiboxenig.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/31b29fcfac0d88e6ffded10e380bd541/94051887676.pdfIn PDF document text
    • http://bjjiffy.com/upload/rijikasetitoz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/u3v1ojq0lt30h4dnkspui64qt1/36020667929.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/18416045712.pdfIn PDF document text
    • http://pk.mo/userfiles/file/87857873518.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/barevowa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa40cb60c6d---95538377072.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/zeladusajawut.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ir8ggt2s236dp6ngef94lbr212/pafowularekegerizidusimi.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kibiloxoparatafidakup.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/munev.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/42547712017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ufo+vpn+cracked+apk+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 17768 bytes
SHA-256: 78d58cf4840881d5c320337ee8a3cad7c90562b92b0d86401f7de6e274091725
font_01_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 10508 bytes
SHA-256: f84db1a6fbd3e669224258bf9478e32a5d5141261f9b7d608ea7b3fc786d18e6
font_02_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15322 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_04_sfnt_off0001685e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685E 1704 bytes
SHA-256: 4399651035424788af89a61815135da753d7a2ba72e38705d6f444edb27b28e2

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