Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ab79a991009684…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 16:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 793ad61f0e5a1ea755307f9035cb340e SHA-1: b8fe312a29657d677cafc1029a6c007fbac36b5b SHA-256: 06ab79a991009684765bffac3ac3e202a99bf8ffec37a3eaac7683e762d22f31
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI_IP_LITERAL indicates a direct link to an IP address, which is a common tactic for phishing and malware distribution. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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 http://komputerzagrosze.pl/userfiles/file/40331901617.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1e76a290---rijomufufik.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/93146437284.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/nebufep.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dd280bc47c744ce4a9e7a8bf84d3f626/wazavinomobuliz.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/1962051031.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/46125247273.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/76955831094.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/55886507807.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/43014877571.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/25828993219.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/80045317292.pdfIn PDF document text
    • https://webaprint.be/img/file/89140007630.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/fulosemufusujopebajeneguj.pdfIn PDF document text
    • http://strap.sk/uploads/files/vuxigujuzadasutize.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/wupanaxerebaluxiri.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210916_025312.pdfPDF link annotation
    • http://baovethanglongmb.com/upload/files/82238052145.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/jekud.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/juruloz.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f253fae226585ddb576f4bb42df1d9a2/79619964487.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/xetodig.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/labaxuvul.pdfIn PDF document text
    • http://hodori247.com/uploads/files/jujujubojagifidijisusuguj.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/96793759399.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/87482748621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+tell+who+is+looking+at+your+instagram+profilePDF 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_off0000b48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48F 11188 bytes
SHA-256: c73335142e6026328ed333b665ea636eeda1f32cf8e06d5574777c6fae3c2760
font_01_sfnt_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 14744 bytes
SHA-256: ec1cafa9b2d17fce48c4f528ae3efcda9d174e89de1d85da64e11f70a20862c3
font_02_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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