Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9931bc5257b3ad2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 14:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fe9457d755a4343efbefeed5d699925 SHA-1: 4351d105cfb4403df2b0e166774159a18fd6c00c SHA-256: b9931bc5257b3ad2c74d9fae1cd8e51689fd9faea6c04073fbfdbad79bc417c5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common tactic for phishing or malware delivery. It contains numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the distribution of a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 70 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 https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/382fe0ff4879158ab8728ff24193cd1e/mujakitorifimid.pdf In PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/kadakifazaxalumekusekuken.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/tesevorulazokelizezafovat.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kamewilematewovexox.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/tekopepenujizejuwobevem.pdfIn PDF document text
    • http://robbes.nl/media/files/41637468699.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/xoropujofazikelema.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/19715821691.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/32380612414.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/vorejakaba.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa691d52a2---24337059387.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/62325134962.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/jevotonitolezuwizinev.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/batikagowotopodiviriju.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/wevozumotovupuloradevofan.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/86263701749.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/83148416177.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/miraxewuboroxo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/852d4968b50ff5498ed391cd7a499f20/96985254788.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/116117417.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/nafaxibewexudirubebut.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/68387811986.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/22873515759.pdfIn PDF document text
    • https://hoavily.com/uploads/files/42922995498.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gifofemaxugajiruzupaviro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=final+fantasy+vii+pc+download+free+full+versionPDF 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_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 10956 bytes
SHA-256: f0dd5262b5b3d0c17a0023e1c7ab86ed4d5a32500ee0480f50a4d66475274a9a
font_01_sfnt_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 14320 bytes
SHA-256: b7d3e5ec7169c981ca4d3a23718a0e21f2c1241035d397e727a04a2194333189
font_02_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1