Malicious PDF — malware analysis report

Static analysis result for SHA-256 07671fd4db01abd3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 04:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e88119818797ff86a505d7eb2da646f SHA-1: f6bed3347333be4d054672c5a93b38362a0354b8 SHA-256: 07671fd4db01abd3d16e1410af1e4ec74f6fb5cb5f9fa1caff17b8ce01d95242
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm pointing to compromised WordPress uploads and disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. While no scripts were explicitly extracted, the PDF format and the presence of embedded URLs suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cardolf.ro/files/vofizigijanol.pdf In PDF document text
    • http://kuppersbusch-center.ru/uploads/files/megogoj.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/wutamowadiripedusorubano.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8e78a5f339c2888208604925a27a6ab1/81784453304.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/gobaduxidi.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/88999647965.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/digagolulozobilokux.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161176e7fe1101---kavebuwedezokib.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/degarupenagu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sotorasivuze.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/xatajejoladogufibawabo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0un2cpsgt784hji072hlmnktd1/63458025386.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ff3ojrtnsfm0nnolpoc1v34ebh/89229897836.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f8578f566---wumopesifegebabavoz.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/85757151120.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/48015991208.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/38767561309.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/9755271254.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ee505715---14164955186.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/nupilonemijezi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c153c8ba0db---vojimudomutoniwo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gar6iqfhpd0uh1hhb2ih664q30/zimil.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dizazuraterikukaw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/3741661704.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22f73536a4---nojaripidivobibavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=banque+verification+techniques+pdfPDF 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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 11036 bytes
SHA-256: 4d0441adb113951cb2cd97466efdec91c3a50bb6106ea082b9c01a4bafa216d8
font_01_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 17120 bytes
SHA-256: 3fa400a3c0b87831d28377a09846f8cb2c7a1f7391e04ffc6a32ab1cd4e5d1c4
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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