Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aafaff48a94c4f4…

MALICIOUS

PDF

89.8 KB Created: 2021-08-17 03:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 910a15b88bad787a50e19933b5f27275 SHA-1: e3abee8fb56ec78f1ec3bee127b3f039585b8a08 SHA-256: 5aafaff48a94c4f4b76b3cdc2efb338181a91f30c76fcaf9037da706d38adbfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/uplcv?utm_term=cambia+tu+futuro+por+las+aperturas+temporales+pdf+descargar PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718a34a310f---jenubapirugosegeluvan.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d8621e8---tunovukuxesotuvol.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/kakexemigorobivorisinalo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dc37c1323---fuzototaripet.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mewurosumat.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc97321fddd---gejekemefukuwupezigege.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/58961787950.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/udjqqhc41rgro8fb6dahsproo2/34280623705.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/92332767c3a1e14e5991f0e801dc2a39/vexijifojozibejezojixe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f46afa843d3---21953276394.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/53496513688.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62b0a4ed32---nikevetababoporaposonu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/16078740176.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/bomubilexepavibexurer.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf38e78761---64244802634.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1dc4a9a6---buvimefemegamate.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/genamik.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/29389538306.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/mujew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 11128 bytes
SHA-256: 4c5e48cebe262adffc5739d5254617c505e08fd703022b94ca7df9bd48d43060
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 19292 bytes
SHA-256: ed7bcc33226a25ede8c0204af960cc8e971a4e7b3a6d0865228ecb15564ab8c2
font_03_sfnt_off00014017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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