Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4f67307ef0d37e…

MALICIOUS

PDF

83.5 KB Created: 2021-07-31 08:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bb70b422ed26098d4b0cb597e6d60306 SHA-1: ccc9b4309ddf760f368d3106dbd73c5c75c9afa4 SHA-256: 7f4f67307ef0d37e5cdf89cad4bc6c8f1e1cc923ac3d809ead11a191f61d66f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=swingline+electric+staple+gun+model+34201+manual PDF link annotation
    • https://prtl.pl/userfiles/file/47972544221.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb000fcbf91---31748738264.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/nosenogefazafapidobix.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/1536798476.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c2qimqo30635s3pb6t7qjd7kvc/89537667719.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935e95796db---3158911466.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e867adb80c965e68e64845d546a75abe/zurov.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/zamikefukifubat.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f44febcf3---66672300651.pdfIn PDF document text
    • http://gptools.net/userfiles/file/7238002491.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/i8ftibaqj158vef9kgrvvr7ht4/63766552747.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/zozivitekinomapibuzikipu.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/28307881015.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8c54221d---fosupeditozaso.pdfIn PDF document text
    • https://triosms.com/userfiles/file/52901902246.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/583e3d7f5d46c89ce99faeac50dafd87/bajemagisomoruguwibo.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/70540280052.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/sabenisesaterimetufepag.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/lemevagipulevixuforagakeb.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2e1f836b2737086b626d5f41b10617e7/70141709342.pdfIn PDF document text
    • https://dacola.com/upload/files/pirozofudasevavonizutaned.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/fuxesiwubu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072155054f0d---xegexezutogeb.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/12151364253.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e339b951f0---vijetepopokositofeb.pdfIn PDF document text
    • 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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 17696 bytes
SHA-256: b0f25c2aa243691da9438895f72615c54f5f5bb385ad5e6789d1e0b103916b8d
font_01_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 11664 bytes
SHA-256: 974643533a01b95ce9e9b2d694c58623813c73fa2e5d47049ae9b7b685ed9e63
font_02_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1