Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8ab4f6c18f70c6…

MALICIOUS

PDF

67.6 KB Created: 2021-10-04 18:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a23613f941d6cc61ddb6c33509789e2e SHA-1: bacc1c4e1412cd56a56741df759cf536cfa4d539 SHA-256: 1b8ab4f6c18f70c69a4e9fe368446d1e9b80f8ce49cfa1f55ceac7eaac2dff5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Several heuristics indicate the document is designed to redirect users to potentially malicious content hosted on compromised websites or IP addresses. The presence of multiple links, including one pointing to an IP address, suggests an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://wmu24.ru/media/file/vefinukafodiwazovodori.pdf In PDF document text
    • http://byty-pardubice.eu/UserFiles/File/29783922733.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161559baa5642f---paxikuzanu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1615000b6b3895---48545036254.pdfPDF link annotation
    • http://pogotowienaukowe.com/Upload/file/55605747823.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0154d281b34eddb1a3472e894a27ab3a/ranizigupipe.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/70269025995.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/rutepululugorix.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/82310651607.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/93277604813.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349f1f04489---47084412024.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/68581727215.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/29763241193.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/laruvufelagizideputuf.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/vuferadogemijiz.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/84760130341.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/58296272193.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109070906009094.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/sodiwami.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/30621335764.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/94486936553.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/lefinoxidizakowasit.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/44344471302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=electrical+abbreviations+and+full+forms+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_off0000adb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB4 13656 bytes
SHA-256: e1ea9242e0ff22ab4ee2018244513951145ae64c6916cac394bc1fe204e0c12b
font_01_sfnt_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 11072 bytes
SHA-256: 5199edbea9ef2af0fe834e7b693c321c155abadac460459b39f2e3adb608f34c

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