Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dc078bb612453b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-01 19:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8580cce79223ffe5854ee99dd8e58a8 SHA-1: 85d0de76032a4db2a83545b26f710efbfa6bd24a SHA-256: 97dc078bb612453b922e8fbddc04fca2206f59f27f1be2637f4df8b40158146f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external resources, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites or download further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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 https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be8a457c1---97383393955.pdf In PDF document text
    • https://radmangroup-ye.com/rgfiles/file/velorijo.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/vojokadowopozovu.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/babiluvapojeboluzonufil.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/zarelubu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/34f7741db2c2107a062110a54cae40e3/zokazovem.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610850ac39a70---74893793284.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50a0ed2de---vogizazoxekozoriboxun.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/42387101597.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/50010278005.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c112a0082cf---risosugasane.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cki8f0iblft0dmiogkqv2t0l46/zubekijusosupodukuz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c20b74c1bc19b6dc87060f8b6febf234/zexali.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/88157131695.pdfIn PDF document text
    • https://luminex.pl/upload/file/jenoxifezijorana.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rametixizamonezipos.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/92404679327.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/peparokedufe.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/19484301432.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/39034472355.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161298fee8b808---xupitonutaliborukij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=online+capstone+projectPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/47f43c83e7314712dcd7d7d0f5070d67/tevone.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_off0000b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 10520 bytes
SHA-256: 1207ed38acda00e69cd54ee2102e7f5b907cdd9d95e554f469da91b83faa9bb5
font_02_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 13832 bytes
SHA-256: 96d03ffeeb4c093c0974454c97d999afcac2ae4b20bc98347697e47b462011e7

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