Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e748c496f9bd4cd…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 21:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2691114f758007f223714383c53336eb SHA-1: a3eccce1f7ec135585056035f446fc2ecac51a6b SHA-256: 6e748c496f9bd4cd4791c914469e39216d12db3125c12aec78d5aa1b17323f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://pt2-turbo-j3t.com/contents//files/22207079824.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ca27e7dd---juruxego.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/jinexebadiziwovo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/h348n4pli992vmo8mhm33n8qnv/13915107761.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6a0b01f1---94929987033.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/xupofivanijukab.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4d1afc35c1d45b937f813c47d294cca9/76307665322.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6a77dd223---96253817050.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/eb54259a3d725d9ce3a1a6f25383f024/9174398488.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0bf893d3---tejarukotonomu.pdfIn PDF document text
    • http://topas.lt/userfiles/file/64937149810.pdfIn PDF document text
    • https://mfdesign.hu/files/file/govatogasedasapulobe.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091129a63d22---pipokivulidebubevutome.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210610_A9D1C372C756E819.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160852f2b2fcf0---66784047193.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/wofegevexuto.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/813266a612fff9d71feb278a668fdb61/vafixoxikejelaxeguwur.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607740c091085---kibozixetagalenaminupulam.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xajetag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reading+comprehension+for+grade+7+with+multiple+choice+questionsPDF 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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 17164 bytes
SHA-256: 13492eac9ac8da03fc0280155a85f2c1a1ed56c0da8673f83db1c36c78b2e164
font_01_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 11492 bytes
SHA-256: c4ab192be95ef20194f2ff25ff5543e2b598a151c4ce083e89887d22222f27bd
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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