Malicious PDF — malware analysis report

Static analysis result for SHA-256 64aa4f7ddf60b347…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 06:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29fb8f2377b99820f4786dd95a3e8630 SHA-1: 898781b614edbe8b4c51f1651ca03f4572a88fc2 SHA-256: 64aa4f7ddf60b347adca6d5d70844f9cd683b0933ea7275ba3f541133f98f1dd
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, which host other PDF files. This suggests a tactic to obscure the true destination and evade detection, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://skybuildinfraprojects.com/uploads/turafaw.pdf In PDF document text
    • http://galaxyjewel.cn/uploadfile/files/12154812518.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109191407068130.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/dogazibezobug.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161302d421f659---mikirewedukelaku.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/ronoxufufeloluvozak.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/45712158976.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dcdpdbatlre3l2lucs70bm2fff/68935459915.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xufufetipupibuzijogabaru.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31180372539.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bd38bd9a2---zolumimikasozuxapafagoneg.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161301a2e15183---bakavafer.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17133992347.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/21360240836.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9b586bb4bc72bbfb88098a48f0640583/benisetobeveko.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109192350379912.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d1845ea6c---72369438738.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/labimedatipomad.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jesubotixenoxatifewu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a385b532---rezuvenerida.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd9eb4adb1---84593447772.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/retafiponidirunisewusuz.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/48513323921.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/nonukozaxofowigamonozumag.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/1310894058.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/1176539291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=geotechnical+engineering+c+venkatramaiah+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_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 11096 bytes
SHA-256: 16e33d409a17102cf46952e1ea3bdbb9251d0b4df7fcf29d0a7415013ec84d0f
font_01_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 17200 bytes
SHA-256: 10fc01c9ffb20d26fc985daf98bd1c40b31997d59f11b75bf2ecb016e834f260

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