Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42c17bea73b81d7…

MALICIOUS

PDF

76.5 KB Created: 2021-08-25 02:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fd67382c4542853b8d2682eb7857114 SHA-1: ae7cd7720497d5c5590f7dccc5b67de87da4241d SHA-256: a42c17bea73b81d7adf9686341310e18a04d4f278d4c89b60db349d811d867ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asiajitu.com/contents//files/72953251638.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079144956770---nobepobanodazotiwapu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/70495798545.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/96q2qgv7qrh6f83eqa3h646739/48911913540.pdfIn PDF document text
    • http://batdongsandautieng.com/upload/ck/files/sobutubabosuwapiz.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/726819948849e0b3f95132c841b609b9/jatezedopowefuwazezo.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/dejerekorowowefap.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/72479065125.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sl7kpnu9mc37tm1iku036pmd30/97484658247.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdbed7903---vodimiguzirir.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/89325258300.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/91854774747.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/tetaz.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/xofitesilatakoravus.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/98608012204.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/51168886427.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285605d8ff---25636159420.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/folujutugurasajujominuz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540756f6fc---tekudenedepilitotizid.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/dupafare.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1c09gvnbs119qmutoe2et2gigo/jigerebug.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/57343f5d2fddb473b3376b48a1735c7a/petipaxilitujonasekunexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=subtracting+fractions+with+unlike+denominators+worksheets+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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 16612 bytes
SHA-256: 10567514c92dd689dc6c09085d8e0eda153ea3ddd2d97904219883a90e3dc32d
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 11560 bytes
SHA-256: 1eb91f212f87093ced67a413a5e442abd132346039efd8c7b76efe1d2d7cf09a
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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