Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f1955851fcc9db…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 13:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54ef970caf83e8da6aa89e30679a1496 SHA-1: c5d4a347b5230f2fa81dea5d48a799551b94bdea SHA-256: 56f1955851fcc9db2da554dac20e73c73899c366b08934cf3ba629cbd6144e84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or 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 distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=the+one+year+love+talk+devotional+for+couples+pdf PDF link annotation
    • http://desagresbrts.com/clients/34568/File/savuxa.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3f73a619461a6b6fe0e88c8b5e511e75/lupojinurajedoxewa.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/rojosesirowuvoxurafi.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/bebutuz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f8c2dfcda812726337c61cdeca3aba26/nerugivixuwujasomune.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69a00d7ab---lawegawil.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210831042226.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/87f95a82d1d44e27e13e5549bba90c48/70574731962.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fqp3re44hh9ph8r9ee14ql98jg/44292234500.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021081621025970554.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5b75v7rtt3ca9ligq8ebodtjuk/lexarabumawenuviregeza.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/81871445196.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad22dd0c0---79240313704.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/gikagu.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/70990415985.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a875r0leon4ghngrbt95j7ac1n/8387782104.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0d9e6dcee62fc84ded143d4d179cc7a/sepebifavisufelubekuzodu.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/sufodafijufafimawozu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a1d9202d---66300879299.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/foronakaweta.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a91f1d5a3c1e3c905624b86a608dd113/fumabefar.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/56496078543.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/96417241188.pdfIn PDF document text
    • http://berbun.com/user_img/file/galobelejitolaxarono.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/65309529483.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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 15856 bytes
SHA-256: d84663547207035804f95af80edc52599cb78c2a5e0555217b846002091c0572
font_01_sfnt_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 11052 bytes
SHA-256: 639447293915bf8dcf7ed71dc8d2a86e517b36e80cf38947ebd116e5d3dcecd5
font_02_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1