Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f43d5d959ad6db8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 11:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a552c6491e07391a85a73239961ada52 SHA-1: 5daf36e3886f8208e03754aac92ddc4d20cfdbec SHA-256: 5f43d5d959ad6db86971f15f6813381e8012bfc77f2feb06379022752c69825f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure, potentially redirecting users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3b38e4d7---mepakanugegu.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479542c998---87984597653.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/4177457093.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a40bd5e28442a926c2a42504b8ff957e/sirelufu.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/23482728883.pdfIn PDF document text
    • http://apcmagon.com/userfiles/59277763013.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/fozitaz.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/41709675167.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/92149301386.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/14627266788.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/94914596268.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/9610637027.pdfIn PDF document text
    • http://yoron.net/up/files/54032977660.pdfIn PDF document text
    • https://p87.hu/files/72580171413.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfc3b752b.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3nmvm8itv99fbvtuheg7urdevh/75606142691.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/55273263109.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8491dad06---zuponupumamumevewadajizul.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97d329333---fawinisazaxumizep.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fekalurekapuwezirolura.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gilozuva.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/kozodeporaboriwetulagize.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/12e4ccf80d1f57ad1f57d948bebcfaaa/26807817357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=technical+interview+questions+on+networking+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 16904 bytes
SHA-256: ddad4561987ae1b7818d80be6e285b8826ec8814148544a58f279a359c9d65e7
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 11352 bytes
SHA-256: 2621f5a5551a2685eba1476ded86b3755070619ea71b4f37bde94b791fb70903

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