Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11b0ffbfa84e4b5…

MALICIOUS

PDF

80.6 KB Created: 2021-10-05 13:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 683622eede082467246d470b217df3f8 SHA-1: 6206ca226dec271e0ca177e3285ee642525e9187 SHA-256: e11b0ffbfa84e4b5bb1c4b76055ace2d7cffc0ade2993088e70ff7b534072584
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links strongly suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://irlanc.ru/uplcv?utm_term=how+do+you+pick+pineapples PDF link annotation
    • http://canxetaianhduc.com/images/file/dipivinujazejosuk.pdfIn PDF document text
    • http://effektfilm.de/files/file/soveviwiwori.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/terakimumifut.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/88315751597.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/nomanuwafivalelileli.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/772d858f122cecc2d4f59c282bb1312e/mifaxabimowimomewu.pdfIn PDF document text
    • http://homeopathyhk.com/files/81649212475.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/wemutejarogawifixavaxome.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/minebufob.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/10555733556.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c823597cd840990d062ea606b2020fe2/weligakuvamuragofid.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/92044240043.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/96899589956.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1377c1ed---vofawubatotozajadefaso.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/42649406558.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/34470972108.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/mizimebelubumuvuvopije.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/66550062507.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/xonunadadenepumuwezex.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/68557425135.pdfIn PDF document text
    • 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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 10692 bytes
SHA-256: d5bcc881e35d674312a3eb670be807234d11819b7dddb9bacd1eea01040d9cdd
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 17664 bytes
SHA-256: 4228f144b48c4295b683d283cf81a95ac250a6e30ea557e6c2aa83b6a31cdb97