Malicious PDF — malware analysis report

Static analysis result for SHA-256 993a8c3122fe527c…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 17:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edfedc3a33b0115e7642d44eeb76f6be SHA-1: 6a2de6ceeba0b9717d7b628891f7cff2f216c253 SHA-256: 993a8c3122fe527c6cb7e4b815ddc24804afcdc56f924c76296d53a09ee0a32f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 67 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://best-of-geldanlagen.de/userfiles/file/zoguxarexino.pdf In PDF document text
    • http://synerfreight.com/syner_upload/images/files/vupobuvopijexoku.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/98058348984.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/satumitisufaxotalinoza.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/43990715178.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gopodawubog.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/nadakodikonim.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/69078357151.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/wonidarazirujo.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/80228421452.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecdb7b6c0e---47928637920.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/vikoripedafen.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/13596504257.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/84978082654.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/3153326408.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/fafifewisukozomubikugus.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/vazokipuvet.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/kuzododijodozetopawebab.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/61023643586.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a245ed22d---jiwugiwilod.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/nelixijidoxaxuzeme.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fikuvesegikolisunowe.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/gadivorikuwezagafapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=onion+messenger+iosPDF 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_off0000ad5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 14524 bytes
SHA-256: af1f2b50d45f4626bdacc0af9313badd86d0a9a38ffd96ad84c5495d65c603fb
font_02_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 10168 bytes
SHA-256: 56379009136bbee7f5fa2765b3cb5eb182b218d1e6d69d05e68cb396db729988

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