Malicious PDF — malware analysis report

Static analysis result for SHA-256 b042e8c8084efe43…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 16:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5c160edb40b41556c4a5d3167c06d79c SHA-1: e6ad043d1b0f271e9b191408a5613e55cb9dc71a SHA-256: b042e8c8084efe43049c750351622edc451b736d67ce688c170e58dc795597a5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains a link farm and specifically impersonates Amazon, directing users to a non-Amazon host, which is a strong indicator of credential phishing. The presence of external URIs and compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+four+rings.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://siroyensao.com/upload/files/wutuxebojozazom.pdf In PDF document text
    • https://hirurgija.me//files/giwamupipugunixamama.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886557a9739---68198221003.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fee4e5210---94688949015.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/nokekubaposikafuveregut.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/53ccde94dd5c7d932c01f61ac5c2132d/sobogakivitipunepu.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/vifozaromaxevoporofeloti.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ecf471dd431b19f154ac38b3c35f5577/21112999401.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/70683627944.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088075ca9990---deratexebosok.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///fekokutogawunavode.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/27431583357.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/vizosekelezeg.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/31212492821.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rbtg6bk9qllu17euebpd0ekocs/luligitigo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e21ea8db---14773381087.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/g97m7t836t7156uk1btf3pqdnd/polizosuwosapudiziz.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe555c059f055335720672f385a22fc8/6084277610.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/87901808308.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/4jrnc1csrtp0pija8jbot0j24e/40629343038.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/28561624572.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810141478c6---44645645996.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/87698908960.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715bf884d30---peganekej.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/tiritapoxubonokile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+four+ringsPDF 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001143f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 17856 bytes
SHA-256: 7a7523085f9155e88ee705fc75f6d078a0075f7f98f3e9a48d335b12729cbdf7
font_02_sfnt_off00014356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 10248 bytes
SHA-256: 8a4e382dd746c3a11f9a7b1abcad577133f5379e0ef816109e153f9cafe49d4d

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