Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa07fa6e14e2c59…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 20:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c84e9c411b7041bafeb48cbcfb4e37de SHA-1: 2b73049df9d3e3ae4abfbe5e6d5109af3ac4c177 SHA-256: 7aa07fa6e14e2c59cb826d0bd750f4f5eca71f6382fe4d4357fd47af95424e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to link farms hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and potentially distribute malware or phishing content. The presence of these link farms and the overall structure align with common techniques used in phishing campaigns delivered via email attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://drafthe.ru/uplcv?utm_term=addiction+poems+about+family PDF link annotation
    • http://ddservice-bmw.pl/userfiles/file/jedowozigabogorejuzi.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8scgm4b3a8cu3rdhnrb7e996cu/583025934.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/40229403812.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/35345042918.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/segitajapulusuvusilomax.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b22677eaff3---71221052937.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/nukarexafujubaw.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/fuxisewarubudokabodekiko.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283b777b14---gujolotez.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873b32976be---gapebuluwukilitiraw.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17cb31a49---tunetofin.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/spcdlvcn6otqvg6n0069d6ula1/setidigozaxesiwum.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zawemo.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/bopugawufiwis.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/ruwomiburuv.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b652523420f95e1efbd3a8cc8ffd41f0/56872384179.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ts7ot0q60rm90kn1dgvbqcqpmc/xaxaderifog.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/juxisabaram.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dblituc58um5inkb43hla8nk6c/99852212859.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zujusekilawisefapod.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609457c4d7d4c---99586604780.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97a188cf7---83547763052.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd662ddc7---zijakuna.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/39268158810.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/luvukegevipipovunegore.pdfIn PDF document text
    • https://inncredel.com/uploads/nupadirupemabu.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_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 11016 bytes
SHA-256: dbb25272c47bc580d5ddfe7d7cf46591ebbb8f66ba66cbdaefc5ae66c666cb5c
font_01_sfnt_off00012e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14682 17204 bytes
SHA-256: 51921a515f98a2463d785231203637907a433580e5913f5e05e90cd5e884a43c

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