Malicious PDF — malware analysis report

Static analysis result for SHA-256 a074dd0d25cc097a…

MALICIOUS

PDF

79.4 KB Created: 2021-08-30 01:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14c03ce0ce163fd25e768a45d6ffbb63 SHA-1: 968a0ea7b1ffa5417fe029c27555c4f5508e93ec SHA-256: a074dd0d25cc097a6db9100aa551f2750d5d17182d05d61e38d059e5e4c4aa95
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a specific detection of 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs, many of which point to other PDF files hosted on compromised websites. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba72c90f952---27790706610.pdf In PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/ninukel.pdfIn PDF document text
    • https://bursaangka.com/contents//files/jizamafujilukakanusutelom.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/87859169626.pdfIn PDF document text
    • http://rc-modeller.se/images/file///rutefupowu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/boxipinokuti.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/48219797747.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/2957910094.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/34005289072.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/20489781694.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ifp1e6paf8k1d4sv3tevahaqqt/zotenapawoxasetigopik.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d6d548093---fadojixopebeliboposa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9067f618d1a1ea9d1b96b3a3d0db0e8b/79299701533.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/pemavogumakexu.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/delepewijanasijawatox.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd60c36a17c---86572893636.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c8250ba9---puterelosebimipolodimel.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/96266bdaa896a585b53c0415c7fa149a/lusifotosekuwowowuw.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/sawofopuwuwevadinapad.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/9b4bcedfe47cfc296f9e37126e7c7795/17072688079.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/22154788711.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95fd1bb5e9b4f8a86f172467f2e6c0d5/vamidulig.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/xasisejopirof.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/10919891463.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942567aec87---fagomebisibasogemagiweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sexy+names+for+girlfriendPDF 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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 10888 bytes
SHA-256: 6af32d17a6608754c1ecf348fca7724a9df3cd319668a1743092772af53ad563
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 16972 bytes
SHA-256: 000ba66443632d473e8b75cf50cef0e5442dd700c51d039f66e15a0264acc55e