Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f012efe770bdca5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 20:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6af23e489761d1c721f20e445a8fd9c SHA-1: 086c2b7c73ee64556398f6bf5742fd23a82ab92f SHA-256: 1f012efe770bdca5de90205f9502267f24e847a8bd3239601e43647df4236605
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to phishing or malware download sites. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=xender+latest+version+2020 PDF link annotation
    • https://padservhosting.com/userfiles/file/vufonesezaw.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/35463588962.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/lasavijumeravekizaw.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/42016768495.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/16207852762.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/jogavat.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/zajufo.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/87941233336.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/nukofiwi.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/viwokarudalakupoleteni.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/70011932493.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jcqpejgntt4t7iub2l0t83frt0/sunobezajokuferi.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/lafet.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/vidiwosotijirakupazodisa.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/10792235210.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/bodafulufuleg.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/42680985399.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/mivivizefafizitibodepidag.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jusajedutitapuv.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mh5lfmr44gquo08ctcehf770l7/xipekilivazozowirotojat.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ou452ijj55m9eddkcv4enrqkc9/40817958383.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa72e5b33c---86136582207.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/bedelos.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_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 17432 bytes
SHA-256: 486e57a001e7e92baf2cd35895dc9b2ae2cb9de7f6597b34aea9c1a22a016ec2
font_01_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 10556 bytes
SHA-256: 0885af59000bee8485adc0a2bf008c73fce3a26293b294ef232fae632c94e380
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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