Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b077ade72363b3…

MALICIOUS

PDF

71.5 KB Created: 2021-09-14 03:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d8cf9c4665be0ddae464224d60cf51f SHA-1: 8838cbe8036fab09a6aaa87497aba242afad9805 SHA-256: 32b077ade72363b3a1580adbf5ba520f0f308ccf575866e67a231ff45ce88e78
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=iptv+kanale+shqip PDF link annotation
    • https://georeno.ca/userfiles/files/54135223521.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/654efc7887bc391aed516b4396775afa/viwukekakenivanenowawo.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/jekilub.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/gufufenosumidawuxemu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3a6ad26f600f38ecc18df99599764b16/70526707164.pdfIn PDF document text
    • https://pecintajp.com/contents/files/kajonowepamopar.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/dugasoferajofe.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/muwefetoxijeg.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161346dbb173b7---tizavuwojatozozuj.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/71001644770.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/zitifevebarita.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fe13577130200d848a03f107bf11eda0/lazofitubiwiginabedab.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/36292094350.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16135db335e27b---nikafunonedowizawekaw.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/30464864753.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/fesezofuseduvorigoxet.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/vikaju.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/85010237780.pdfIn PDF document text
    • https://kawanmto.com/contents/files/togelapuwixe.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fudipigidugukipividevetoj.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/82361472815.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/10866526869.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/kebanalivofelegavejizogim.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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 10384 bytes
SHA-256: 9fbdeffc81c48b27ee924221a0e1d8e6b8eb3cdf8127bf3fcc7773fa680b9ed5
font_02_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 16696 bytes
SHA-256: ea0138df2f85fbfa64847c138a6c88ab5af4ba37856d08c482740e040f771199

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