Malicious PDF — malware analysis report

Static analysis result for SHA-256 862c0e558d826e31…

MALICIOUS

PDF

83.3 KB Created: 2021-07-17 01:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a8390c09e10684a65e7d0cb3549c265 SHA-1: 8672bbab0c1883f254b2eda2ce41a28d7b68a76a SHA-256: 862c0e558d826e315bb0e42952976bd2c4022f5bb0ddf6c51960246012fd0726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. No scripts were extracted, but the structure suggests it's designed to lure users into clicking through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/bp5rugccmtj4s3qcfabb74v6ue/92743424500.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2b7fb8a7be4d521da16189a1d1457e87/ravejexenos.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d25c58e648---20239521882.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/6427975828.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/75622718657.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/p96ehv32ttrkhqe7gg05kv4e50/jidepagupuwavonofozujajiz.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f5a187b9c40cd24f2d32c519ce522a6b/povafavosavufulujerom.pdfIn PDF document text
    • https://aaaxxion.info/images/file/netebofegemerafoz.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mvn1rgcdqfitnjdk487ltqdld5/vukoxuridedoto.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vepujenatufoj.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tirevefavavu.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/1808193725.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/10458339746.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/62435789569.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/f7cc2932dd27ca2035f305b167e457b1/73808747828.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/41763814166.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845a479e737---fuzoralimosa.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/9297908344.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/61d9123fddce1bbf1a97b7778aac0479/gojojekeguxak.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/57325753127.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df455296ddf---46833762468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=1+coulomb+equalsPDF 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_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 10336 bytes
SHA-256: 843184781788cb3d657946a4dd91f1306e928948de5823ca23985264c7f04ea9
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 18312 bytes
SHA-256: 1794e9247c188fcfaec1cceb0bda4c5808643459ebef46b3563a0b6ef0f4b07d
font_02_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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