Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5819df5308a81e…

MALICIOUS

PDF

67.7 KB Created: 2021-09-30 22:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b18e3a7dbaf8300b36d43a8f182d57c2 SHA-1: 93ea2efa4fe32395ea94a5f09d8441c4ed51bd87 SHA-256: aa5819df5308a81e7551bab7d6e4375e0120aa7c26e15d61c554f404b3492c6b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The document body is heavily obfuscated, but the heuristics indicate it contains a link farm pointing to various domains, many of which appear to be compromised CMS uploads. The primary lure URL is https://inwebjor.ru/uplcv?utm_term=watch+friends+season+3, suggesting a potential attempt to trick users with enticing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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 67 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.
  • 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://inwebjor.ru/uplcv?utm_term=watch+friends+season+3 PDF link annotation
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/6999861616.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/37642398498.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/79203899252.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161414eb0cfcbe---posaziremiketipujoto.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/62618765353.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/88167526471.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab6886278---natatomeguvuzi.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/90816438912.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/69821723804.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/fagenivatotunakasi.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/mabanol.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q74e020q6adealvueljspvfh5q/loxoruxukarumududisazisi.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/24178823.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/62745034407.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/jelikubaxix.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/redidogizuvekij.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/79104076377.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614988c4c95e1---92805130596.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gepeluvatobov.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/24259100042.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/xavoka.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/24344069919.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/gododesezirinonenexana.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_off0000ae24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE24 13924 bytes
SHA-256: 61a4497083cdb65561b4e2f383b04dc4a4e194507b21753a14bd9d059a3d423c
font_01_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 10692 bytes
SHA-256: da257bc5e34729a25ca1db0728fd0642fa1bbb25b722d906c0d5ac8de2e1e4c2
font_02_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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