Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1628e5445059b7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 02:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7dcc642538d6e38635faad8e63182129 SHA-1: e6eb3e663c5287734c74cbbbb2f64954da800991 SHA-256: fb1628e5445059b7efb769b793218ef9e71290bf1dda7b95e5b4442eaa951a89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to exploit users via malicious redirects, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hengtaixin.com/HangShun/ckfinder/userfiles/files/67134632424.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12f248f7f---sibepaxipifibe.pdfIn PDF document text
    • https://airshow-bg.com/file/dujijuzadiwerobizejit.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/fapezelemil.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/28547096174.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078330675702---vufuwebadakelokezuridara.pdfIn PDF document text
    • https://carlojans.com/cms/file/12028567470.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/lifugofa.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/josijofelo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/85abbc552b8ba27e0cf740f271253617/kijewidaxijoke.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/zezejekasoxetesikek.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/deduji.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/41580965073.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/79651500887.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02418fbec---98805977220.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8dce2e12---jikofot.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/48710388976.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/92847961648.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/bokarelijetuxil.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161219347d129c---26563396882.pdfIn PDF document text
    • https://12tiga.com/contents//files/xoxesovara.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872825ef67b---97789504853.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8c8ebc57529d98248ecb380ca06d5d4/miwimijoladivunuxazi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb26de3a93---vososamuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jnana+yoga+practice+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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 18388 bytes
SHA-256: 757c4ab93a9f3c6d5e3f77cae4ca4c7c8cf0c408dd438eca50c299c0b490679c
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 10688 bytes
SHA-256: ab84d18ace1e6b67eb16a139e43386d67c80a24a8effb31ae1dabdea76e75c0d
font_02_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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