Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c64e83978a75f67…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 21:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d2fbee1619e7f56ab316868886291f1 SHA-1: bf6144d36200c59d0c7bbf8e5b6bd593f41ef0db SHA-256: 0c64e83978a75f67d00fef65bf13fc67cf596c47f1dd8e6e9cfdf7d892ddcce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous PDFs on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and links points towards an effort to evade detection and maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://linhkienhunganh.vn/luutru/files/84110205123.pdf In PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/sowalebamiwiputuk.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/99454853501.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/016852e80f697e284cac8f13d89738bf/nidam.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863117a44f4---64118744117.pdfIn PDF document text
    • http://sciattella.net/images/file/10816695740.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d98506bc---xatubenoripejedidunedan.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/83407332603.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/tojejofujupenupop.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8c9ee1e18d38bc9cdd633677fed52cd/pewivubujipubinixunu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/50268295128.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o2enbmnr9nen4p9bg66quk1khv/bofarezesulerowimivowolo.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/wenarop.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/73577698903.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3e1325d6---sifopagumar.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/82678173294.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kuwitakofozaminepodeli.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/xofuvosiladokamagu.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/41644601540.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/17894894363.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hpoqr28imuh8cb9sjkivhjjqd8/fejamuli.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/rowalufovetugox.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/22461565170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=acgih+industrial+ventilation+manual+29th+editionPDF 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 18836 bytes
SHA-256: 9436707998b7da1070b77b632c3940cf5f0ac9cb80917a2d70852bf16e1bde72
font_01_sfnt_off00010eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 11252 bytes
SHA-256: a121f97bd4c89970cbfbf61bccdf666bbe7e8d0d4d73dc44c21bc988c1b1dc09

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