Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb1c0deb14b6fa0…

MALICIOUS

PDF

88.5 KB Created: 2021-07-26 13:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a821971ade90cc0368549e7d876e8c49 SHA-1: 7469163b96f5bcdc4a702e5935a5896eb4b5fd29 SHA-256: 2fb1c0deb14b6fa03a6e132219f3eebdf953883e0b6a0cb524e96a6d1f36dd5e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDFs, many hosted on compromised or disposable domains, indicating a malicious intent to distribute further malware. The heuristic firings, particularly 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly suggest a link farm designed to host and distribute malicious files. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bayernglobal.de/userVZ//file/zigegumejuxomeme.pdf In PDF document text
    • http://elite-nails.pl/Upload/file/2846816845.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/jomasujonilaxoxiva.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/telufudosududepawu.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/pelotujowug.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210611_063221.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/83888608620.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/21878525151.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2b3fa124a15b321da9cd2673d3007f77/gejanebeleziwujax.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/80176998068.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd065cb34---tiwanefeleso.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/cc361e35d50093bad63d66c040e52a18/tijixidovebisagivig.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a85ce9674bdf976bd0737421a72d4e5e/42528523599.pdfIn PDF document text
    • http://keacg.com/upload/files/gabadizisexomatuje.pdfIn PDF document text
    • http://jaika.in/images/documents/files/15590348646.pdfIn PDF document text
    • https://arerp.kr/data/file///lunenije.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/41470383237.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcefc1d63ee---mamuxexewuz.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920704cfccb---lebexozemixonu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a568d7ed04---66464501708.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/456bbe07e6814d73543438999f113f59/47759186626.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b266084e462---tigutuvebiramogujefixewud.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1701aea546---rafotujumeguweter.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/sodemifetefojixowa.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/81611148399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+write+a+price+increase+noticePDF 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_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 18104 bytes
SHA-256: 04c20af6f187096e0b7cce4cf805845365dc0ad97fa8628c846ebe50c38dd8ce
font_01_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B96 10400 bytes
SHA-256: 4306cbfca2e1b4ae915281b063da273b68f8b19a22b2df169bda3313ad8021f0

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