Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb23eaaba56a6431…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 05:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14a9a73cd0de59d51f7524de9b9c39e8 SHA-1: e244e1bb89ef7e0cc111c22f60cfed5ba21ea580 SHA-256: bb23eaaba56a64316d70f387b753ef1d73a2f489afa3b6bf7374efa3e17ff7b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, some of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Download' button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=download+prince+of+persia+mod+apk PDF link annotation
    • http://appinaris.net/ckfinder/userfiles/publics/files/36614044418.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/turugexolufibejefe.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/92710414053.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/tamonojikobi.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/4212528830.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/48549940345.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/79685269173.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/kujexuligibusorululova.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/49479110290.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rebedavuzotamolizezofopa.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/mulobi.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/58913790822.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/015994b27d98eebe056abfab75dbbd5d/wolakibaguzenuv.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/sikaritilumoxalil.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zekupazesuwepe.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/xomajosojatosajebitoxi.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/josuzap.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133db0f616be---ronivurozuwogewapekuga.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/jepeguwedarukaz.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/9380305754.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/10d5813c2acc1aa9b66bdf2a373162c2/luvofezanixulepivizerivot.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/213a3f48bef0d7317391f47972d74cc5/zonakuxebe.pdfIn PDF document text
    • 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_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 10864 bytes
SHA-256: e75e8d57446d8fc9512509ec78734e616c5337e0328a6036f14b808808c8e740
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 17488 bytes
SHA-256: fd16b43af3634093b696ad803fc5e026a577653bebe5b7eb1d00467308e9fed0
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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