Malicious PDF — malware analysis report

Static analysis result for SHA-256 f451902ad51428e6…

MALICIOUS

PDF

82.0 KB Created: 2021-10-05 06:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1912fefea44513aed735a5234e37983 SHA-1: 480a4639641303cb96b4917434338edb3e6c5608 SHA-256: f451902ad51428e6743a8de1b91942940643272531e5e9cab04a333871b6f03f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161514df427bf2---fagabamunasukaz.pdf In PDF document text
    • https://igk-lilienthal.de/downloads/62852510030.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c114ba23ad---70020362208.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/nefekapotutiveka.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/raxiduvotikuzasikivux.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/budupezapegewaxovude.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/digarimomokagu.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/tulejigujizasurajutonizuv.pdfIn PDF document text
    • http://eventechsite.com/files/files/32982416238.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/kafuk.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/14100456514.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/sisov.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/nanijakakumefekowiginazas.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/wisaferuxamajo.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/36309432020.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/86336391811.pdfIn PDF document text
    • https://agt.twwebmarket.com/ckfinder/userfiles/files/nukodixelewunif.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/88359754819.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/6808652376.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/bologijibet.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/25932950547.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093c494368---67287131495.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/jinire.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/18939045019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sports+head+football+unblocked+gamesPDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 11380 bytes
SHA-256: 0808ac5f1c3c971acfab237b3081e4c8a92dc98d5c9ef5b3f09c178d43a3c12e
font_01_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 18160 bytes
SHA-256: c7cf045c845c6a93a8ddde24c05413c0485e30ca358e6b73a9f87b788b0562da
font_02_sfnt_off00012244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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