Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b4117d8dc2e6b2…

MALICIOUS

PDF

85.7 KB Created: 2021-07-25 01:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52da182e650152593ddfb8c0ba4a9a5f SHA-1: 827f4ade93c7bea900242349f86f354ff7151dbb SHA-256: f3b4117d8dc2e6b2bfd57eea7c1b72be47469ca2d2f2270762745d631c5d5b8c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160700d9b30729---muvom.pdf In PDF document text
    • https://jxloanchien.com/style/postimage/file/1118213290.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db27b47753---98006521154.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a796c73d067---subawo.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/rorexunipomujal.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160788704b137f---54815294954.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/suzitiruxematu.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/dopatemafafowigavudu.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/62825285888.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/odhj577d0deqa1oc6c59uh9iou/xupogetemezawu.pdfIn PDF document text
    • http://haai.org/upload/file/19506033473.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/596e2903822001fef9a0d1e6f93d2741/lefipelopimez.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/91269231608.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f5c6f490279c9db41dd754f56dc4db26/93743943997.pdfIn PDF document text
    • http://araonline.hu/uploads/file/67598183109.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/55113110561.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/67994946533.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/1ef68e4895e676727cd4ecdef48ff7c0/98365316873.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/27886312390.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5d1c1d02b1ec6c62d0123ecfc36b45dc/woliposi.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/76005060722.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724d4eb2712---vadazefopomumevowu.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/lazovimot.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tobetuboxifuva.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nisarivabebolixokijamowep.pdfIn PDF document text
    • http://rsst77.ru/upload/files/65854889777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=my+hero+academia+english+voice+actorsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 17120 bytes
SHA-256: 870436d51657e62de35708d7fcf0ad6f24fef22283925c310cd979133c82966d
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 2232 bytes
SHA-256: 94876dad267db2fc8d94ae36d9957f9093dd1b7f26a769d152a97d73f1a9c734
font_03_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 10988 bytes
SHA-256: 41f22713c80840a08b2d24e8ec5184cff958bc370e4ea172d4f9810b3e22a1e3

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