Malicious PDF — malware analysis report

Static analysis result for SHA-256 a957c96e1f0daad2…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 04:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26bf39b0178378e7fff592efa7d49adb SHA-1: 9051fd9930b6b8a55ce0ddab02a42c78bd4392f9 SHA-256: a957c96e1f0daad26b48a968bdef861ae1539a659af2373a0271abd8c5c4a649
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains malformed streams and is flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains, indicative of a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it leverages embedded content to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://aire-limpio.com/img/editor/file/tamanexitojizedevisivi.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b97e91283---vodagobadoxaxamozogarera.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/53995778936.pdfIn PDF document text
    • http://lg-palette.com/upload/files/49032296647.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/30596804574.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/32677672380.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/rixupijopaworeko.pdfIn PDF document text
    • http://ctm.it/userfiles/file/9684128895.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161304fe32bd6b---78923369681.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/gilivezolanesovowexeguf.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/bofidizi.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/78209091426.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/68914940117.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e837d00205e205e229192388f7999f81/salemobelaze.pdfIn PDF document text
    • http://dongphat.net/upload/files/tudosi.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/talevalasezoxixijoza.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/xinudedupuvofafexaxinez.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/monoluwesu.pdfIn PDF document text
    • https://wsbtitan.com/images/file/lixowagufinuzuwivof.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/25511233517.pdfIn PDF document text
    • https://aksusu.com/upload/files/rotovizamirusepamis.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/65720885597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nouns+that+begin+with+the+letter+aPDF 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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 10688 bytes
SHA-256: a673e534b3d25ac97d1c73d23baf8f9e3414083aa84b1364eef557fb92a214d5
font_01_sfnt_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 17024 bytes
SHA-256: d4264ce991f738389396b12b2cc25cd2fecde69cf1e0ad8e023a46562afcbb4e

Open this report in the interactive analyzer, or submit your own file for analysis.