Malicious PDF — malware analysis report

Static analysis result for SHA-256 2894b88bdaff36bb…

MALICIOUS

PDF

89.9 KB Created: 2021-08-31 05:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c729e224d79b6bc693edda9b374f7e25 SHA-1: 3797ba5b83decd088bb437c9fdea4b7371904b34 SHA-256: 2894b88bdaff36bbbdf80b8ac564bd53e111d825e7664460ddf04b42f6a8b01c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/407f0c4f74bcea23c65967cb0c8231fd/75140657092.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c96069821c2a5103177393ee82cea427/wirafeteg.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611092f0aef6b---8916886333.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210813071150_f4wonf.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/67551728213.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/82382795630.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/vqn5det0ie7on0b4oshvfr2jm7/ribakagufusulusis.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/xujegadukulipibavug.pdfIn PDF document text
    • http://haphadoor.com/upload/files/xazuxivalifozivopoz.pdfIn PDF document text
    • http://funperm.ru/content/file/45306014721.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8f639149---20081673470.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa444a1cf6---xupifevodelidotigigu.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/82393361942.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9d41bj52t4750nb27fub1antta/40739349607.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/wukikok.pdfIn PDF document text
    • http://roocenter.ru/upload/file/59234255067.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0fa67989---fuzulasu.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/654819853.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/faxarogiv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d28a25b0a5b4853608896d6bb55b3816/tupaporogujixig.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/72798445055.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/tisuzinojivutalodal.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pebafudote.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/xasamovevojuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=i+love+you+forever+andPDF 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_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 10220 bytes
SHA-256: 62514f0a90633fbff8cd6cf1c804cf33fbc0839068a694368deb47bc56305eea
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 18512 bytes
SHA-256: 418d17254ab6e0f98a5dec03189ad75503e42230c702e59c4e02d0dc2f4fab21
font_02_sfnt_off000141b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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