Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f918b391aa350e3…

MALICIOUS

PDF

112.5 KB Created: 2021-09-05 03:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba4da8050850838305ab86e7770283f8 SHA-1: cda652c546943edf081e7e7ed41af9df84990455 SHA-256: 0f918b391aa350e338c94175d730d5aa343526db4a063f287347ae58f2c1de8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b5leshiq53b8vku3qtlt061ob8/banopelamaf.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/57570929085.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/dinalikosezebelara.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/99044037248.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/18547516379.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161115599d22ad---50295316514.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gawelamubesilunosi.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/64440538126.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca23df21ce---3760137352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98078e2834---zawijifetufepibiwi.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/66866813366.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/20209620494.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/toramuzato.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be52362c61f---zavokemuretobopabowasosi.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/45017429715.pdfIn PDF document text
    • http://citra.cl/userfiles/file/gunubilagipokiwutewozi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/19339818840.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1aea95b7b2b304ed9ff94cdbfbbe6ed1/56381349006.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc03d3e3cb---lilel.pdfIn PDF document text
    • http://scpt.it/userfiles/files/kuzapunez.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a7134929715---43627802891.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16100d14821632---jisimi.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/67951068233.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/gekotevudode.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/zunoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=test+de+wartegg+ficha+tecnica+pdfPDF 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_off0001515e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515E 19220 bytes
SHA-256: 835002c4c1a82f080262ae386786d0e0ca88f0858fd08d4945e4bbcd049859e4
font_01_sfnt_off00018314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18314 10780 bytes
SHA-256: 07844148d89ef36c85ffa34f86e44f7a18398901a9a4d8dd28410dca9c18a0a4
font_02_sfnt_off00019bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1