Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e2850b03daa139…

MALICIOUS

PDF

88.3 KB Created: 2021-08-07 13:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67219dbeb6c1feba67f84f18a4d50bbc SHA-1: 8ba86e06cdc471b203291bf42729356fb03a9b13 SHA-256: 78e2850b03daa1392531a8dd8c1321287d462b5c0d5b5422e0943f6f03452568
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and other potentially malicious content. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e4d258974---55112372771.pdf In PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/18472139601.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160922385e921c---81098832381.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db33eacbf---60630599340.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/65096993231.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f46ad35db---80063505736.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/41090322370.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/pijinolaronafugenovugem.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/mirimikimikezepitaj.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/rikidenufoput.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/pafibirujomoleji.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b9d59b06---kewonodarekilubazuzopapi.pdfIn PDF document text
    • http://dentherapia.hu/files/file/1527943820.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/enerelofemafoze.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lodajanalenulezado.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/47146244938.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080377582726---nedoniwuboga.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8dad08482---vubafejase.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/40055253143.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/65673376808.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/61166497680.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7023f582b1---26022361479.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/40045270552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nvidia+driver+not+working+windows+10PDF 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_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 17912 bytes
SHA-256: 7b791920bc6deaa021133db44586d079f1b865444098727994a56d485fd8ceed
font_01_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 10772 bytes
SHA-256: ac5b968c6e7adb1109eb1331da6a7ada3130682c10d136fce5142bbd3f49fb08

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