Malicious PDF — malware analysis report

Static analysis result for SHA-256 570c7dd2059486e2…

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 15:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c53bc9c67f57304f46e779877579fe62 SHA-1: 8eca7e0a544147d79eedf0fd5229081b1cf08113 SHA-256: 570c7dd2059486e2c1a061743214d28d10040c61d9897f2f82a12f53df2e32a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution attempt. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kramor.bg/userfiles/file/kizuvuvifimibesuziwe.pdf In PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/belatakexudozekurujofevak.pdfIn PDF document text
    • http://brukbet.com/user_images/file/jimapazelagilipolol.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/dafugaditobarojilogeti.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6bc3d869---sivigujep.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/42575712744.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613956a75abce---43847258156.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/lixaz.pdfIn PDF document text
    • http://yilip.net/userData/board/file/xuwowazigejoguvovuz.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/96673725361.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/98448208774.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253c6970ff---66661682999.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/73211452392.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wupujeme.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/23060382337.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/zetajuj.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/duzidefal.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/29810418983.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/12/file/41849610781.pdfIn PDF document text
    • http://apart1day.ru/file/lijokufutupos.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/42177502094.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/42951382978.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/32b95a0ac87056d062e542683c3128ce/kumusuxuvibudakejenon.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/binete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=oxford+practice+grammar+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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 18672 bytes
SHA-256: 6416a97447fd3c951023c4306a1df52bcea8f9cdec4ae85e8225cb002a8bb652
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 10772 bytes
SHA-256: 92d8e4269e79dbeeb5508019137b98c942e40572a5a87e7ac7570a5bfb537d87
font_02_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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