Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb29eb35251f3886…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 17:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 723cbee3eb520cbaee93b1d3a303f696 SHA-1: 25026605a013bd4c79799312fd3c37940ba0c6bf SHA-256: bb29eb35251f38860d0fdf8df93801e441218be41c8d27a49e8f2edca06b4a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links implies an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=jaguar+f+type+manual+for+sale PDF link annotation
    • http://isystemlab.com/admin/ckfinder/userfiles/files/satorotuwesoxufarowosopo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4269d6ebc4---32440246672.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1281c57ba---23248915504.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/31965167139.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/94983275022.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a87511c6e---tukepalasopavuwekawuto.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402d8c6d55---mudipojuraborotipinokapu.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/59218765580.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210623102407105.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e554faac64d43a012f3391cc387cad18/xideziwo.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/vufujotekuvofav.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/69749344683.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kofibanob.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/522fb17853d6dd05040eb20cefcae508/zazubolude.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc4d643bc3---femaveridowe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4904ae71---5256937953.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bujuxujuni.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/85432525636.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/jasowudi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/euf1ags6u8c1tpsrp9gp19qb3i/rodulasujukukupufuxovusim.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sijama.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/38772215572.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/87761527183.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/lawalifesagezefidusel.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/fuzewusij.pdfIn PDF document text
    • http://ibb-online.ru/f/file/rugigitolofebikusuk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 17476 bytes
SHA-256: fb4331fd460544468580c7f1694054772edf09c099d979a5a050ca03c818831e
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 10812 bytes
SHA-256: 850f533f4bed2593cdff657212a4eeafa2ed14b205847da7474ac49e3570b6c3
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1