Malicious PDF — malware analysis report

Static analysis result for SHA-256 111c9cb35e140a6c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-06 12:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc2c605f01438827e73a43c4e0a13109 SHA-1: a4a12eb32f2f382af6676093da5ff4886408e083 SHA-256: 111c9cb35e140a6c535b410333b24e0ae9e8a419a010ed7ce79643ed907f6e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. The presence of external URIs and the nature of the detected heuristics suggest a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e94383fbb---80279466272.pdf In PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e58819cf---witevefu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609484b9d514c---34313257945.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/39324959934.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af263781ba---xifizomimobax.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fabeboxakexitikurujaze.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e0fc3f27---47400889261.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/waradutativeziridik.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/pghe3vunfa0va2hg640e7df7f3/77625065865.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/4890427458.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1c05916db8454d47328ff43063faedfa/fanajuvorome.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1bb30a20d---41412093829.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2672307b8---lomezatuxijusoximasomisi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16087f95ac355a---2245722908.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/notofanagafok.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/80711035322.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f432e0c9f---megusifuni.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/59349255706.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/1713041967.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f55d73d2e17c5796c68043effc804a45/8858562814.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b10476c2bef---81574078175.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/97898378022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=linear+algebra+serge+lang+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_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 14400 bytes
SHA-256: e99eb9a654e14b4e50fc455db2aa667ba8007bea7810abac2d5890809543e99d
font_01_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 10552 bytes
SHA-256: 00d1b8a8020a332eac3cc241326738280a7f6c9b358c5846ec47444e071c5f3f