Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ad4ee4a2881bc1…

MALICIOUS

PDF

83.0 KB Created: 2021-07-25 03:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d8d695d69f03e6bbe2c27585a394e62 SHA-1: 301fe18219b3fc937ab6ea46c88789e148189a35 SHA-256: b7ad4ee4a2881bc1f03672ce87a6de4da70c8021a0f5d8a89d72d21dca5ff8ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://wisserarm.nl/app/webroot/files/userfiles/files/53536998106.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9ab57be3436a3620941fee0258e1284f/lavugenigarojuti.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aac5717db---83992744860.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e169bc926f---5244887312.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/64960829095.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/47192287428.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/640a5a2b905644a60cc4b2fff428c307/54078476309.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c7db9d20---sikaremoxadebekenesas.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9k2199cpoijnsd2nubo6vit9tp/tilovigalirixapeberewusij.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7965f9b180119530b69a6be5c4b5a52c/29691459607.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/bakasopakaxeru.pdfIn PDF document text
    • http://apvn.info/userfiles/file/35926867231.pdfIn PDF document text
    • http://stattus.com/assets/file/tazufi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210606_AB968C0D51AFF4EF.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609520d172ab1---7893655182.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xumivufu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59d231baf3---71731578674.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/73920611630.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/vatokekivirejizuwa.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/48037574886.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b17336d4477905ec85bbda808a146c9b/nikatiwujuposiwemotipopis.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/42049067265.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ae0d970f---kigegawunave.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/277bd51a200266504229e8ef4ffd4aab/70427375634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=duck+life+2+hacked+max+statsPDF 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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 10832 bytes
SHA-256: 2aeee9cb109f9fb7bcdb78e16993c408888d383e2dea758c6852f2ba0f0fef9c
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 16792 bytes
SHA-256: 84d689af54fa1b102d1553e5d965b25f3f1fb074991b37ded4ed7d10fbe56192
font_02_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1