Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f3288db8622763…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 04:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 298bd405187931933b836fb9c20340bf SHA-1: 714ba26a0bdbe619aac44be61f924fc3e1aab51b SHA-256: 85f3288db8622763a169dc5baa33076f5be7792197bab8cd4d5d6c33df5e3250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://noithatkuongthinh.com/uploads/files/wawokijunute.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303036463bd---puzupiwizisuguxa.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/sowubifumonora.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/47176137242.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/30104768628.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/mirezu.pdfIn PDF document text
    • http://servmed.net/userfiles/file/borejawijano.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/fubatolawuterori.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/dozosidero.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a7c29c7---fesopubarusonu.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/43408570482.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/28204770435.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/43743236679.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/dodigowiteb.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7d23507c957ee00d5de7883db79a5477/ketasulupirujuzavawabuzi.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/99205870694.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210908192235.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/wireviserogufelirudugu.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/59115624421.pdfIn PDF document text
    • http://eventechsite.com/files/files/62525955610.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gfmnnl20mnmt2i6mn0bhvj2b52/pabokureto.pdfIn PDF document text
    • https://keongracun.org/contents/files/21582222726.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/9434733244.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/sepizalufulajod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=strike+force+apk+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 10628 bytes
SHA-256: 0c36fc19f976944f6f5d7ee76553e145ae99d48fb6d064d7403b6300a68bda32
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 25000 bytes
SHA-256: cd94d01e9a89e009e6d37cb3ac21b8bacbc6ddc851bb95002eb5e1fd84a40aa4
font_02_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 1924 bytes
SHA-256: 388e0582fee03206f4ae7906d75e9011a5f9de4afdee868cf5e517bcd13a891b

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