Malicious PDF — malware analysis report

Static analysis result for SHA-256 72db0a989262318e…

MALICIOUS

PDF

89.0 KB Created: 2021-06-09 21:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 93ea51223d94259b26a6ded73a97069a SHA-1: 1fe2c112d9086ade1d72dc6db24223cb0ca35d7b SHA-256: 72db0a989262318e403eb945deb8f67ad6c1b37babcae3e250195e2b5618daf0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=kingsman+2+tamil+dubbed PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/031af25d29b22848c4af7af3a5a1ea61/kavipabup.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4tlprsb1kdjqkthot16fg2k34a/92147130372.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a990b0c597468acb71b361a812e2e265/pagiridupis.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c00fd5ae237---19830155067.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sodapunazenavifu.pdfIn PDF document text
    • http://strandedtattoo.net/file/46270449770.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/eb156f49ff81cdb957516c9fac82747b/pikodonalawikez.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t5h4emoitci1ep7d76cjvgdagd/28685994821.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bc8e455071bc92f315b833c594fe648f/27419507488.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-1/20210601163325635352.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e702f98d16---menunedavugogubiwigiz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb4fec729---55324038189.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bidarulugi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xifomip.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/lowil.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/qugvjvhq76qrl1d93kt3r54h3l/jotuzeliligedez.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fd64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFD64 14572 bytes
SHA-256: 68c6893647d616f757313dae69a4711b676c555e88ea2deae54ed676a90b758c
font_00_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 5064 bytes
SHA-256: 42ce36fe4eb5b3d7b48e9bf1c95469e5557b845c3064bdc1989af17f59a3065d
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 12704 bytes
SHA-256: 65dbb84c9234ba8be598430c1263b2f47ca7836ee002db407c962b094359ed03
font_03_sfnt_off000148c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2