Malicious PDF — malware analysis report

Static analysis result for SHA-256 6672b5565e1ced6a…

MALICIOUS

PDF

84.0 KB Created: 2021-07-15 20:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88babd2a2dcadef24f3e6cb6b8835a0a SHA-1: bd0b96b2974aae71b749e18fab7dbfea7b5959d1 SHA-256: 6672b5565e1ced6a05124205924b73c66b2609915db5e35046bf3ef39d153a0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised WordPress upload directories. While no executable scripts were extracted, the presence of these links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72823cb3---zugalezegavivagife.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210510192525188329754.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/bomobivosizukevewimewari.pdfIn PDF document text
    • http://webbuilders.com/files/file/nulodebavunalezovatet.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/rewevuma.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c201a91571c8dce14d81c89e9645a965/66000939435.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/hf6tv6aov3j9f0b5timbjrs4l7/mafopuvalovej.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db520ad031f---15137389429.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1ac13fd4d71b5478f51ed382d0e7b630/58353747809.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lizesetuvusuvikoxuv.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/75246349855.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/katolox.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/60015803114.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/43272121882.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/1547070fb5fc2869b29d1ab2afe65fea/21910008989.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/01fc9f9708944e112d4ba25adc3e7e6d/54553898373.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v4ar19e552as1jgd5vbc329ml2/45363353475.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/59668232766.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/68655888016.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3ihgemsr2ujv82dfi6kbi7nogr/59139741914.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ef8d9b36---1750814058.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/tavarokuvemobowaralujagi.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/pemapumewurebigozesukupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=side+to+side+step+upsPDF 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_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 16860 bytes
SHA-256: cfc3757cd05d3d01e1b558ffaa64aa8795afde3a3be5d88d20db69025b4a8c53
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 10148 bytes
SHA-256: 13a790eb06be3bbb3bfd2f8f2ac8cb180c4cce01f89718b19abe67473090ced3

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