Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64638035ab3c75d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-20 17:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6ab37a40067475104ba4c4665df0177 SHA-1: 0dff865392ce3f7153f0c83d06a01e729b8be09c SHA-256: b64638035ab3c75d5384a30839b6f142fa98798922c908796841615ad7ebcaea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=how+long+can+cooked+chicken+be+kept PDF link annotation
    • https://conviviodihera.it/dati/upload/file/guxeriwetowogoruvafigu.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/vupabijapuvutipeka.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/jomafofinijozawisaserugob.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/67480817858.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/049d0f725812913b1a2d993f6b9f282b/84932949995.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/59156485849.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/78055669387.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/pinukifofobudebej.pdfIn PDF document text
    • https://magerp.org/upload/files/30241594199.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3579e141---67388923304.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zuzatevagusagajakafani.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/gasawuziv.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20086116093.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210919111716.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/29544131212.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/61314605893.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/sexikuduwobaxox.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/76703057139.pdfIn PDF document text
    • https://beautydent.hu/editor_up/36776716338.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/sikogeribalasurixam.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/papasikijalubemajof.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612febf890e92---54524370327.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/topafikekovusimurarovepip.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/xexelisivurorubudekanizos.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/9320786746.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/68297d9fabf71d277b230df6621a0331/kugud.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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 18412 bytes
SHA-256: d1769a4795ac2f49b83b4d3aef413b7938f9f9d027cba84279d058b974187a34
font_01_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 10836 bytes
SHA-256: 611cbf9c4a036b651109736872533c0da7a9284e5a73906704612ad03a4cbb33

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