Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b0e7fe00a80e9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 16:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 869ee381f1e83ae6df4b5c6bc31cc667 SHA-1: 2bc6a692e387667f84a904bc806840223444adda SHA-256: bb6b0e7fe00a80e9b266584874145e4885501ac514eb45e57954549bcf68955f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised websites or disposable domains. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at driving traffic to specific landing pages.

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=drastic+apk+ita PDF link annotation
    • http://villapellegrino.it/userfiles/files/87786935979.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/61292594246.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/87327445668.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigexesakozaxewotefolujo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/lobemadixunejaletelike.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0aa97c1a663e59a78b145114b59abb73/bubodolosi.pdfIn PDF document text
    • http://dezis.ru/uploads/files/nemafapurojadejopoga.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/11293521602.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/12303479117.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/fekuxerikejuvirijijow.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/luvijikuk.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/vunolujabenebixotu.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/79050609075.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/demimigigizapiviguloge.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/vogadal.pdfIn PDF document text
    • https://mediaskills.rs/files/47899153501.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161486b74a69b9---6305203215.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/regulop.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/tukededi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6dd2d1c158c127fc158fd72a39fae08/jabatinuzijuvazok.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e5cp8culs4b46a9c83844hc3k9/63255635311.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210919221849.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/wolatakugev.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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 17964 bytes
SHA-256: 36af45f9f4757f7e99eb9c2a7abf990a8301bcbc22b30e37ddb102533cc31c5c
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 10056 bytes
SHA-256: 8761cfa49400f4af223f7e3f110c499f5e0e7133b76cdfe5bb32ae24f82dbc8a
font_02_sfnt_off00012050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1