Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1df2d8b8ab2eaf…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 06:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: afd02fd22d43cdff27d79e30b5b4fe5e SHA-1: 0d5492aab72daf01a729b3e4c5300408f87f8ff4 SHA-256: 9c1df2d8b8ab2eafac101bb0d48299635c72e98aedd08cd5a9d1b842df222e4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=pdf+to+ppt+converter+offline+free+download PDF link annotation
    • https://dpmceramiche.it/file/1232952625.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6ul8en587c200rn3ula95sqvk1/36679520892.pdfIn PDF document text
    • http://cke.hk/userfiles/18445943601.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0d35fe0deff42a9459a332a95575a4b1/wabuguleneveropo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612559f640147---vafikebifafexipufupadota.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e3c9af9b6818eda72e067bdb3761c557/bokofiwuxugilununof.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/kirurujovalutupemolalub.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/88303141322.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/52066157393.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ridazureborakeroleniza.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/vilelokife.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/fojedojisimore.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/togekeviduxipugudete.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624241543266069772.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/92747108173.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5c9995c29f77bbb8474fc47b43f7755c/51840370709.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f3bee068---47616520304.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/43189812168.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/wabafozumilolejekevapasi.pdfIn PDF document text
    • http://jucal.es/images/file/fobuvixolikekibegidum.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kibojukozokesolet.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b1c288be---rifozimupe.pdfIn PDF document text
    • http://salwex.hu/file/kovixodujusoporepenir.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_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 16852 bytes
SHA-256: 49bf1cf18983d556d0bc3fbae213e913ca1095659f2215a57b31aa7a1e5cf46c
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 10596 bytes
SHA-256: 21d6a25d4e63069722722ef18d7e5cba499f43652480fa4a6d4f34c0218b3b0a

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