Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f463c5a1982b468…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 05:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bca84585f301473ef765597300cdc410 SHA-1: 71cc463e9473b2384402818799f0d2ef6490ef9a SHA-256: 9f463c5a1982b468ed48e6d9b8f248893974fe7d013389a9f7386dd1220b1391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs and the document's structure suggest an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://vienhung.com/webroot/img/files/44733171478.pdf In PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091302231873499.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/23949189242.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/fezuzubudapenula.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/48622464641.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c8f1c064---61782342370.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/lenibev.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/28183538446.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/sikusadawobipov.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/lemexomisafoninonufabuwej.pdfIn PDF document text
    • http://ucokampen.com/media/files/58562793315.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/22821811556.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11339f102---79791028456.pdfIn PDF document text
    • http://mgrima.com/files/file/60343204833.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/jamotona.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0f67683a---bekuxapijofujekebumerogo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d050d51---47366287657.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed95866e18---kejifewimurijexutuxu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/47875664181.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/71t94skcdc3r4agufl21de2piu/jitufuvabumejiferinejox.pdfIn PDF document text
    • http://gzpropellers.com/uploadfile/files/3280244292.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210910060115.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/5239422192.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/lejonuzajoxedigaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=conjuring+3+full+movie+in+englishPDF 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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 10900 bytes
SHA-256: 7283ceb5189fe149073bafdc8381fdb4da06a57785163386ac917341d76f09ac
font_01_sfnt_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 16900 bytes
SHA-256: 788adae1b0edb814b4443f27b0a33b4860ad5ed8679aa7fc98b3c39985b218ad

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