Malicious PDF — malware analysis report

Static analysis result for SHA-256 751868b77ca59f50…

MALICIOUS

PDF

94.2 KB Created: 2021-09-02 21:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 502248d5c9cf9939b8c16fc551309e26 SHA-1: bc6f03d129a19a76ba6cde5c967c28a499141efe SHA-256: 751868b77ca59f50f285b2ba452bebc4685d1f1c3abb3f403004edf127306c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised WordPress sites or disposable domains, designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to exploit PDF vulnerabilities or host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 https://chcial.ru/uplcv?utm_term=importance+of+test+validity+pdf PDF link annotation
    • https://renesens21.com/ressources/upload/files/21875037136.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6a9fec2c7ec55f3c51dcc1d83ff2746b/zafufozaxuforoderolewin.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/48407602832.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/kalobemogupokukifape.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210831064628.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070162808d0b---lulikutoxiterowurogoroj.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/virifofumenu.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/70566312997.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ac2e511e---55791616197.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/23666157924.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861e99f35ad---mugeme.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/926efcded1b1a668eff89dbe597314e5/92313368592.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f775f807fd---lebabutamugo.pdfIn PDF document text
    • http://tele-video.ru/upload/files/82506696491.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/93457329418.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/metakij.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/897ba974c80d3f1a25b9f2956e9cd8d8/tolizopobidusu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad86cc5edc0---55798189466.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/67126457246.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/483bvfokm9n8h87v3jf4h0ao86/fotozimebuxe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d341a836a1---sovapaj.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/33752582100.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e94cb78a---41776105638.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/tojetetufamazeduje.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/mipenez.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qplastcea534pg0sgq7guetoeb/86810638728.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://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_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 18888 bytes
SHA-256: 53b218e0b1cb78ffec5def39896b8f640a2ed126c17709836d59d2398638c840
font_01_sfnt_off00013bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DF 10912 bytes
SHA-256: 1d6f333f2b16a72eeb287bf80ae1c859fe781d86f0586c1580448608c341da3e

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