Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11a2dacffce8a38…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 22:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 25d51411b158af0ad266d1b49a0a10f7 SHA-1: 286e952006e895283d3c50eb548d7104dd910b79 SHA-256: a11a2dacffce8a38ab09aea10c1d94e4bde5d85898a5a20bc31f3b8ced0989be
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://queure.ru/uplcv?utm_term=friends+the+one+with+the+jellyfish+full+episode PDF link annotation
    • http://impex-italia.it/userfiles/files/63577193578.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/sidimigipanokemo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161350df1e14a0---35684682890.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/ganirewalozuri.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/19235432478.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tiwuvufu.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/fozaravepixesupevudofafi.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/94349943139.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146584ae7e75---tofejajerexupoti.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/nevozobaromamoju.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/46324832174.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/6207575735.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392571bc9c7---fewuvaxazuributufum.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/24044116395.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/rifufivonamoz.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/71af0ad422e25c7107c790d9d04f7f8b/mozenekigumanuf.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9d0fa26b6352dce21b7951842e84d16a/dubenegupogo.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/vapimikevuju.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pixilolametutizi.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109202126138211.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/87162692722.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/72523458582.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090200593588.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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10840 bytes
SHA-256: a0ee1e8fc436807497b91840f90f3a058952c8e932bbcc84e29c6801a6a52b18
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 17904 bytes
SHA-256: d57ef0ba437178e8f47671d57d7fa40e017694f4f7e5ae83045cc2b00837ba91
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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