Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e142d1d4b7ecc2…

MALICIOUS

PDF

87.4 KB Created: 2021-07-06 23:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0686a221e1f4c4a9b737366b25559ee SHA-1: da1f5bb9d1478843a489dd47612a2e282ff72148 SHA-256: 49e142d1d4b7ecc298a70853e4662efaeb90071dfc85eaeaef403ef30ab21575
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.jobsincrete.gr/images/_user_na/file/49892169767.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/af6002f1872ba69ba69a721bd0ecca0e/56848710882.pdf
    • https://qqhanoman.com/contents//files/50266858054.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/8192f75f578e10b7afb8f774df7cffe3/5302456154.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/475cb70737a2bfede7c1e4bdc2d19005/17791656387.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/6258285612.pdf
    • https://nutstudio.it/userfiles/file/45861898928.pdf
    • http://trekkingsapatours.com/upload/files/fuxigomemurabefagaza.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092406250af1---petaxukubedajivewufow.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3be56e6a---89574360280.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2dba77c7---lubada.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/zuwawa.pdf
    • http://champaigncursillo.com/userfiles/file/sewemobetaxupuxoma.pdf
    • https://nic-irq.com/userfiles/files/7148808596.pdf
    • http://php-lounge.de/userfiles/file/muwugulitomabatadapate.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/28b433fcfaeac0214fa42255ba617d45/tazogozobekasusojolujalos.pdf
    • https://autosaloncenter.com/uploads/file/jakirasirurataxopez.pdf
    • http://www.contectrade.hu/fckfiles/file/13010979689.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d13784b17e8f7f2899754c7e21b2de37/radamutoruzunadaputivose.pdf
    • https://ikuseikyokai.jp/ckmedia//files/52987325927.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bca09f6a---91941775987.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ae63f604---ledoma.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9345fde6---38328465249.pdf
    • http://cbgnfinance.com/userfiles/file/nosugenazobuvemede.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/6221877487.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8t0olq7bp41fce8u6tuo6940ai/13484180381.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=guide+to+parallel+operating+systems+with+windows+10+and+linux+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef81.bin
643b4afdea93ad6bbf818a42b3bdedd2f78f6e051a47923a21f66628de3e78b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 11560 bytes
font_01_sfnt_off00010aab.bin
f34e75851db7e9bbe08f4f1de5d866c221ab76486f561d6aeb2cbf9b736eec61
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 17184 bytes
font_02_sfnt_off0001376e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 16792 bytes