Malicious PDF — malware analysis report

Static analysis result for SHA-256 860692c39b1b66ff…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 13:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4554a5c9ccbb9a57050a94fa631ffb3e SHA-1: 0a0df8145c5c12aa7183d124f89a80ade3a1b57f SHA-256: 860692c39b1b66ffcc029f910bd2e823825ee7f6edba41f96504a67cb1bd28d1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a phishing lure, presenting a screenshot to conceal clickable links. One such link, 'https://philabc.ru/uplcv?utm_term=has+my+android+been+hacked', is embedded, likely directing users to a malicious site. Additionally, embedded JavaScript streams were detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://philabc.ru/uplcv?utm_term=has+my+android+been+hacked PDF link annotation
    • http://elma-itc.ru/!upload/files/78782643385.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/niranuvametarutoxi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a39d177e70868717e4eb0c50ba31580c/84407627677.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/vatemasejar.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d140d32347251514ea1838fd1ffd880d/73749268405.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/38945204118.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/tezesilajoziv.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/nonisaluwuji.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/92864317082.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/dojosexawiniw.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109250535544871.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/wakaba.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/bakososiwiwomezava.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/49744241141.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/6848515402.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/76751139987.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/seteralo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae287f9eb---jesovedas.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/41193300294.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/99968969711.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/dazaneniwujilovajanob.pdfIn PDF document text
    • http://blccy.com/userfiles/files/pewijaverim.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/jokavuxejodi.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/11859048671.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/949e16ad687d70788e71db7c15e88e7c/93289004396.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_off0000afcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCD 14152 bytes
SHA-256: 538151b3faa1ed7aa2dad1661f6986a9f610eb0d074690290e187ccc7aaae870
font_01_sfnt_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 10828 bytes
SHA-256: 9361bdc1dd4c07454786acfdef5ad1d15f350b3f07320d1c3439e3a26d20a582

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