Malicious PDF — malware analysis report

Static analysis result for SHA-256 f181b3205cfea084…

MALICIOUS

PDF

88.9 KB Created: 2021-09-08 13:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efa67dc7a1fdd147fea994762b532418 SHA-1: 661870bea86289fe232ec01c5aa70769927bcd00 SHA-256: f181b3205cfea084d3ed0a86adc90e3e12ac76b272731850ba167685d41ab4df
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mansiya.com/uploadfile/files/mepinowuwojudidamupod.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2d685f27---8111648070.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/17500606527.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/95940517823.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/v0t1o4imcv0g3mntf675uhb72a/98053577225.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/vafusa.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/timufefarosinolumaw.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/69931886300.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/wototimukako.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/zimaros.pdfPDF link annotation
    • https://akamercedes.com/images/uploads/files/lafejokavobilukafarim.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/vofif.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/berexinawesozek.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/44189112420.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/wozivewaseguz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613854c9132b6---80930356002.pdfIn PDF document text
    • http://agama-rc.com/upload/files/35644669922.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/36896007060.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/30712436800.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/8797376711.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/69770897924.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/99455516204.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/nikuvazojilasawojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=autodesk+recap+tutorial+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_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10680 bytes
SHA-256: 17ea1447cca961dedb54a92f02cf22a24faa0a5e6219cdb671b5a813bdc9d2a8
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 20796 bytes
SHA-256: bddc091b137525833ee04e1cb7a50b705c26abb3af1055946899f7aead058cae
font_02_sfnt_off00013e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1