Malicious PDF — malware analysis report

Static analysis result for SHA-256 4886e05635b162b7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 13:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2493baff4b63c2889612fbbd8a790a32 SHA-1: 1f914766fc2b42c7514b3537b6a352bbcc28a87c SHA-256: 4886e05635b162b7eda745993dfd55f79936ee0bf45013937ee5b1ef9a7b1f89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple potentially compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves redirecting users to phishing sites or further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://palet-school.com/files/files/wopetixutij.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/koloponogizolasirusi.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wubeza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd50bf3c3---xevurupulukobeg.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/42738063682.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e20640bf0a6c1bde6614469e01fec7fc/furubowivugefefolewaxegag.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/senojoseno.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/66016751453.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/54126085712.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/tukelutonajafafupopape.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5e816a401261bd4c375d07765f058679/sodefuvore.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613450f5e6d2d---burudorezirufi.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/29965423717.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/bumudapikoboweleputudofeb.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109070136158802.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/fuxufotiluluxajudasufara.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/60125452334.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/fudivobexopepumegiwopage.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/keniganulugutiw.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vp66ajrpdb8nnq7g9jtjcntds7/jawev.pdfIn PDF document text
    • http://bptramptour.pl/files/file/79082802505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+system+ui+on+an+android+phonePDF link annotation
    • https://easyown.ddproperty.com/datas/files/sedajekazopajiri.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_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 18116 bytes
SHA-256: 9537f78d43593717405e10c0dae7a222001b6c2ece36780dbcf43d469440f810
font_02_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 10816 bytes
SHA-256: 75d39dd433fb52920fd491e736ba3d7a2e964e863bddc291c6b7d9791d635712

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