Malicious PDF — malware analysis report

Static analysis result for SHA-256 411332d530df73fb…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 14:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2a1613a725c7ee2830cd1cff01e12029 SHA-1: 2c74edf0e9b1b83bd1a19e9e79d7f729e9b1e386 SHA-256: 411332d530df73fbbf1154da83862f52d3acde53e32bdfb3119f6e213805ab63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into clicking through for phishing or malware. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://irlanc.ru/uplcv?utm_term=redmi+note+10+customer+care+number PDF link annotation
    • https://gruntbudowa.pl/files/file/nafamul.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wifoxigaru.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/97424679719.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb737d374---xuzebudabefixupexuraxok.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfb8acb84---gomeg.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/44716663258.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/9448544397.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1hapnqdo3hs48cp4qr3m3omaem/2986631326.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/80694374476.pdfIn PDF document text
    • http://home-plast.ru/foto/files/dinedego.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/relodize.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/82877808980.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5af5ae9abc1382a0af9e42c0c540638a/nojifulok.pdfIn PDF document text
    • http://brenderup.ro/mm/file/guvarifutere.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/60023501235.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zaxowo.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/regiregusetexataro.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zigido.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/79924970091.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fubililimuxodolomamifel.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/dokimegodowat.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/89262761480.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://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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 17464 bytes
SHA-256: 04badef8b8426620b53b2b79ceae221558663df9a94e53c353e7dc377dc79413
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 10944 bytes
SHA-256: 3a9a99e9d22d6ae160f272a3cecb7f7c89b4d9b0f442e0e2627a56d05a1c9696
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1