Malicious PDF — malware analysis report

Static analysis result for SHA-256 33acf91b358aff33…

MALICIOUS

PDF

89.2 KB Created: 2021-08-13 15:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23a30258fb280e0f019c36d1efc12184 SHA-1: dfaf59a81eadd3f9276165ef81a263874e548dbf SHA-256: 33acf91b358aff33989de7281b8d0608efa039a868422012065b781ec815c9cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://prestinieurope.com/userfiles/files/xunimudenedomuga.pdf In PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3df5aa95fffd819a4cef016fedaa65cb/moxufupodafugebolow.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/xuded.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/rotupegalivakaposakedasez.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/magitisejuguwageti.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210801154951_xmhru4.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46907928420.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/badawigosifedof.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/48505123870.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/bozoziwa.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/lematoxera.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jl6dmk2njdr7697inpu0t12jv5/60012059666.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/jipumuzobad.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f36894cbb61b27e6fe0f5e35014e344a/2272137502.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/44483819373.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/f79tmk7s1dom8p9aj19l8r6dk5/10263303764.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/tndc275m4hsf11e35fq9o2sigb/52324133526.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/dowumikunugovaniwalusumo.pdfIn PDF document text
    • http://apsons.eu/files/file/42673605218.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4baff324a903820951c524f27ba55f2e/80228466914.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/warowadevefabob.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/newusutofozatuwilusafuto.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/loxadevisujisutudun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ab95d0a41---94330722979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=juegos+de+laberintos+para+ni%C3%B1os+para+imprimir+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 1696 bytes
SHA-256: a6074013d6572f0de6787d975d173c412a661e1f9a9a1ef05a0986883507aa90
font_01_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 11280 bytes
SHA-256: 4811d6915e1a0a90294c09004909271a01d21caf7f64a48ffce84a33d54d13bc
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 18156 bytes
SHA-256: 76b60ba95672709275f065000850083ef334538452570c80d2589320a21079e7
font_03_sfnt_off00013b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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