Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f90548f7559a53…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 00:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a245c3f33734f0b7302e89df018d1623 SHA-1: 38b604b6fb7dbb8e5287151f3850372b98fc1dfd SHA-256: d8f90548f7559a5390591f2fc38b9ebb01f8177e9c2e78b51d1ab2c1c214f143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://ssanadia.in/userfiles/file/dilufulovutikigekivigoka.pdf In PDF document text
    • http://gyn-ordi.at/myPix/file/xuzavejatumeviji.pdfIn PDF document text
    • http://akssert.com/userfiles/files/10402212716.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/17606019820.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd12456821---mesarunapedim.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/delizugonodola.pdfIn PDF document text
    • http://kasargod.net/uploads/file/vudix.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/51171729729.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/limuxolepodagadojuda.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16106070670908---78797928924.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/77114087344.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/jetetiwaluboj.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gopunedodiludesenexuxo.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ult55b50327puj02aq829pt2ek/31597963523.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f8358cc14---73081558862.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c42d4442---nodexiwadetek.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/803145582.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160be23096c275---23376045221.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8feb37b5---94805248179.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c798d59ddb---turupenaxilikovofa.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hcen0ics15q5gvebc5po8gang4/dobuduxirazobidofosotug.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/gixosojov.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109040505143044.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/folutofalofetitowonovizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pariksha+manthan+pdfPDF 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_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 17612 bytes
SHA-256: 7e21285b1aeba17940bd66f61cd378894f2f8cfcecfb992ffe7a7555516649ac
font_01_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 10556 bytes
SHA-256: 40e6cb627b34446855de782ee0f1597b5a047492ba05215da73942ff24d6f01d