Malicious PDF — malware analysis report

Static analysis result for SHA-256 09834a5de2e70bdf…

MALICIOUS

PDF

85.5 KB Created: 2021-08-03 08:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a392eeb7f88e44e36ad8c0ac8e7ad85 SHA-1: 29c7450f5c6426284201d99a6810933b89cf3712 SHA-256: 09834a5de2e70bdf59a016e18dd7306b019ff302c8c4bec8654fd6e804e240b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The primary goal appears to be directing users to external, untrusted resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609153e1148c3---jemilotozadaxisabo.pdf In PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/77145019774.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/dararujimumuwuwutoxe.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/kalunegabom.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/94112408553.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7ac0bdbe73f4a1d6478e8aab076b63db/47424071892.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/deved.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089716ba3f71---2954529329.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/45765451238.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/gobut.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074798103e91---zuwuputad.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a65326d38---84335729077.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/81311363438.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tuagtqvau57oiqmo5fgtpn20re/tawujewakajevesadofubudot.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqs5qfk4dlb3j61etr7cjlg7h9/60151288625.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c1ebd03a5fcdb12d67bedbd658bd2615/gasalajofinepeg.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/naletumejamowoj.pdfIn PDF document text
    • https://mavibusiness.it/file/42847882218.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2669173a42310a61dcb6e78b29d9a3b4/87913534083.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/34259766827.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/75331557906.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af9f77157530dc631738f8028f661ccd/lojibagesuziwofitixafod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cuentos+infantiles+el+erizo+y+el+globoPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/lorowugagaxax.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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 18020 bytes
SHA-256: 39e3d8b875f8b52b45be1e4d98e1d35169b1e1db0a406bbd1abd9637938a9882
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10836 bytes
SHA-256: b413f851853a627b63e07cb351f15d503348458e94a66050e5d66c3a7e66e750

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