Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05a8619502cd31b…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 03:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3f7fcacace6809d028bb6959f12d6e2 SHA-1: c93bb02865497a00bd05e8b045798f1d56f795dd SHA-256: b05a8619502cd31b6ef99d813c785a5400691e39d497f7e39b259a07fe485fb6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide a malicious link. Multiple URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://demirlermetal.com/resimler/files/86497294226.pdf In PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/jinumutajalaxowu.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/76658527193.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/60730732205.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/37862316598.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/67451236643.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/97a911952b9d462f707e6dfb25886c03/6462491209.pdfIn PDF document text
    • https://digiconelectronics.com/media/48118142018.pdfIn PDF document text
    • https://linker.tw/files/79346722001.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/22968804648.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/80029520197.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/34017546087.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/gixifuzevonosivijikedesog.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/pewagikurodududojaromiwo.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/85607079307.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109021412136786.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/30829443350.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/kimoxokekajilazowosaxuf.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/fapifisawivezoza.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea955e691a---gowasebug.pdfIn PDF document text
    • http://sandiego.songhakbbq.com/uploads/files/wagazaxasopujag.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/554cdaaf465f4aaafb86bac149dfe75c/75957091261.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/58863140852.pdfIn PDF document text
    • http://labonscafe.com/userfiles/rugepagopemixopevewobegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=60+atomic+adventure+apkPDF 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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 14216 bytes
SHA-256: 924cf4effd99f0e6d0b7bf7ab421ec2fe861d8661bd8f18e15dce9de99796eb5
font_01_sfnt_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10912 bytes
SHA-256: 86d8811604870284a924c6bd1e166776f62887e0ff127c4cf3551bc73f4c7bcd

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