Malicious PDF — malware analysis report

Static analysis result for SHA-256 0549d3482f2c1eda…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 19:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d56401c62f5ed4d2cbde40a1584b811 SHA-1: c467796afee2fbced4581d1dced9db1c5c2123ac SHA-256: 0549d3482f2c1eda8b7452248f6438f4e16bbc6d5ed44cf83c2e1a3e5197908f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, indicating a likely attempt to lure users to malicious content or downloads. The presence of external URIs and a link farm on disposable hosting further supports a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5bb17944---28725966848.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/su59mbdqajibmnj85lq22bde71/vukubu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nuvob.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/fovoja.pdfIn PDF document text
    • https://banghenails.com/upload/file/xapopowalasox.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/wuxubix.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e018b5d1---9435000383.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5838d1e3d3---fosilimewilakis.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/taxizafaxexe.pdfIn PDF document text
    • http://cl-pub.com/files/files/46090098346.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/67393916724.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/ximarexepin.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/44551191192.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/38e427fd382f50a26a3aa13d1eeb1c16/zegukikuxodoja.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/559756b2e01a3581b8a8b1ead2a77591/nedevuwajusojajo.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/491525211.pdfIn PDF document text
    • http://vtaky.sk/media/file/85256576343.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voworijufunasakaja.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8cee3dccda351a16ff11955334918397/1979134513.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/86594339376.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/9323616362.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/buduvevuxigulawoguso.pdfPDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986c014acbf---detebigadatib.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8b6d4c29---87169053047.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sc6s0d0nlt9mm940hm0u3e6sl1/kuguduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tarot+divination+crowley+pdfPDF 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_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 17956 bytes
SHA-256: 591f6091f3011dd28f2bc47f267c39db8a522ea75247d6bf3e3ee18258e82b3b
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 10676 bytes
SHA-256: 8bb09e446ab9d423661fd562e9c6a03efad091bea3c887b3dc67783f901bb0d3

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