Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d39c33d908ff0c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31f9faf5260fb779ca8a83f757ea34d5 SHA-1: e27f0173eae527b3dd68aeaf994021a2504c34e2 SHA-256: a5d39c33d908ff0c8fbba1c03a61e5744af4e501cecd07dea527554f1593216b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and a link farm that utilizes compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://americansemitruckparts.com/d/files/kapila.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc4257125---jasalikozijuwizimadelazuv.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/27508651760.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/nojetodad.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/fabuzifopizosexetif.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/46601990935.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/62061771518.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/89333179942.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/puxekivozofadagamu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/dejusapuvonene.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fidur.pdfIn PDF document text
    • http://leguido.net/files/50615038330.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/84733935455.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/47645247526.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/46169575459.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wimeruzanumidusesabo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f31acc0d9---zikobekagawipurileki.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b5644620---50796029335.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ff6e5bf8---vigivolulabizaf.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lizazixexijiwabojeduza.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/57952455932.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/2341644317.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/85332930504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=romantic+love+true+love+good+morning+shayariPDF 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_off0000afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 15396 bytes
SHA-256: 6d20edf7ce5be15d1317bc1d1af1aef50ef3d49ceca88f33f3681a84962c8c7c
font_01_sfnt_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11144 bytes
SHA-256: 01391dad40859ec1d4f1b96cbf7d30ec832f99dcea5c85deef9af36d431dc324
font_03_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd

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