Malicious PDF — malware analysis report

Static analysis result for SHA-256 582a0c3e7a3e59e6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 04:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2db5c515d26697920db85dbdf7dd3a4 SHA-1: ca98fbe64bc7d5a9b2d38a17d31fc2fafe771042 SHA-256: 582a0c3e7a3e59e6ecaf57f72cb4365f85d915e21fd54e0c8406a82d5c68e2a8
164 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues about its intent beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kvkumariajnkvv.org/singhania/downloads/file/zurenenamiguji.pdf In PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/topizavekogobexu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a9f3e8845---12625684016.pdfIn PDF document text
    • http://strahyi.ru/images/file/zesapojebelibudogadagid.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1b8f64076a1b0ecef8232a42ae393b51/mamogifodegekeguvokot.pdfIn PDF document text
    • http://adlinefor.com/home/webagen/public_html/korn/data/file/54979755504.pdfIn PDF document text
    • https://silga.ca/userfiles/file/vapadefazus.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/tobizefonul.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/97154968486.pdfIn PDF document text
    • http://geose.ru/userfiles/file/38056128155.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/226084860bb871ecb3d7.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/vuxukupudizugivoji.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0562cd23a2472523f4d265d481f2d69e/vobomijexetagoba.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/naruvurofasupabomapa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0agaui8jsghst03d0f0f325og6/87695931098.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/nobezetimelugigefuxaki.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/dilijijipodegefopawetiruk.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c7cf610898f9bfecc268ec76842cf089/wonegopamazopimivaboni.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d2f76765a86e65632b6bc724cf53733a/dosifu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/57b77809ad9113cb741118d726788b1c/53046294425.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98a22f990---zojusililu.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/86075108621.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/39360531882.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c0vhfvlg5kk1cij71jk8pihk0/digofilidelinetidamutaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=is+it+ok+to+freeze+cooked+chickenPDF 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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 10468 bytes
SHA-256: afd8e3dc619768f5e997738f2156b14acc796d1462b6283b0fe2b6a26b1662ad
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 17260 bytes
SHA-256: 72470785af81d81438cc82a892ebe0e78d1194899ab5fdb5f67e815c14d9152e