Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17d08ab95646f38…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 22:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3af61633137172818c4e39b6bd19cec SHA-1: 588bb73b29e8cebb2ae6c904a04527f63205a653 SHA-256: a17d08ab95646f38ca24453c4eab6ae3cdeeb3c1e8014e0e0db2011b388d9227
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a likely phishing or redirection scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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://rinducm1.com/contents/files/werivamibiguredazixe.pdf In PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/51295660187.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/31062746535.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/wevalakofejetomezamutuno.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/531a0f6086c123951bd9dd0b3883f514/rafilijuvidek.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/828919f5e68b76128adbe9cbff3945c5/lofobipexukigasudezojewum.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/99145149642.pdfIn PDF document text
    • https://eslms.com/userfiles/file/91609887698.pdfIn PDF document text
    • http://sdds.be/userfiles/file/50378615981.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/15885156615.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/soluzezabebawekudutig.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/93318587589.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/mevidizoseri.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gmm4ltoqpj02aovvrp8ul70ml0/45901989114.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210903_042808.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/67450695878.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091008251128.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dikimazamugaz.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/kuvupulujafetokikexo.pdfIn PDF document text
    • http://identik.hu/editor_up/51995290488.pdfIn PDF document text
    • http://nensi.si/upload/file/5152067631.pdfIn PDF document text
    • https://bdata.vn/upload/files/63272735170.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/2012125643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+go+free+onlinePDF 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10220 bytes
SHA-256: c18ba9efa66a1eeb7aed63b0e3bbac4967799ce6311b989cdc88e1c7dcd25ea9
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 17188 bytes
SHA-256: c0f0d791370f7cc26d236d13d2266a934b08e5edbb187c8812c2ea2aab6c5fe8
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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