Malicious PDF — malware analysis report

Static analysis result for SHA-256 703a3ef766e160f1…

MALICIOUS

PDF

114.2 KB Created: 2021-08-04 20:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 545e0a50075ba3adb5390c8415221b8c SHA-1: 6016ae5a8344475512e9e89c3871b851f707658c SHA-256: 703a3ef766e160f124f01b2fbd19d11fd5c2f78877711075b9c3b033aa85c141
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 WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc8f56d99c---37843586048.pdf In PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/winejewagumopedofitej.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/13625056907.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/89c38f6dd8d884540f4957b4da19e871/gilokepamuro.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0c64df681ff7b788d6aa8e694955aed6/61929879475.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91b51b541---3636588496.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/24171290853.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/razifodugajafiba.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbabd3e97a---13281209339.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b904fbc069fc64d795d1dcaf41e38a55/82611235212.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xugopinojemiwovuvuvefula.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xamawadasujepux.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/27aa8098ee3e34fa3373362e11053b63/43442941340.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ee4tmdejh3g1rp4hf5e6aqj8c0/rekasiwijeva.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210730023002.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f0d93e4185df1bfdf95aaa74cee2541d/sudenizogajufaziji.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/38fqc2e9ae2c7lglsc900pkisi/lajimimuwimudevurik.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/33215029194.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6677f33b---331224225.pdfIn PDF document text
    • https://airbays.com/userfiles/file/diduzirevexebokuvopexefij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+a+ninjutsuPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014742.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14742 19032 bytes
SHA-256: 2c12e7631668512ef63576bb91766314ea8c854268d27f20b6c256daaaa52a1d
font_00_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 26352 bytes
SHA-256: 6ae6c9d7acaf98ee1cf996a35e235c2d317a7dfe17da4c258b611a89ab49ab0f
font_02_sfnt_off00016698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16698 11316 bytes
SHA-256: 09345a0d7b1a4be13e71cd6d1e0c145a5ebcc0b48c49dac45b84428743550aeb
font_03_sfnt_off00018a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A25D 10028 bytes
SHA-256: b1cc4b9aa6c6640eae65509ef7ed8406e69787bcb7a2d14cd50c31969a90dfd2

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