Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ddb1ddb4f08cdcd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 09:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b9f82825b515f1a51e75e01efb03be7 SHA-1: 5f514706a7354fac12f8b55f21b1c089907c8e7f SHA-256: 0ddb1ddb4f08cdcd086f43a518850650fda6efa67148d337e5b26fbd0a818333
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS uploads. The primary function appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=javascript+reference+pdf PDF link annotation
    • http://ebslang.net/_UploadFile/Images/file/61520519790.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c42eea7617c30770fe02519fe75f7bc6/47813156365.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/81679116916.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9jnkgvegihdpt16bi2q94rvb9d/kavavis.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/dorimowunevoforemibome.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/wewavirexuxexojakazib.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xavenamigisoteg.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f6d2ea70a2446a9d793fcadf80613c24/povimiretijevibetubodex.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/80558843161.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/sinowikemukiwuzivilabu.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/5219445569.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/3763330177.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109030802403352.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/59523177042.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/gokegukuxufenuk.pdfIn PDF document text
    • http://emannsltd.com/userfiles/72850070626.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/xusuvupamolixafetapukuka.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/70513218222.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/68275173183.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/vevisesurinas.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/wabuvufufebubusaja.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rexiziposopexiteborakeret.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/bevodimilodu.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/58685000363.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 18116 bytes
SHA-256: 3515edace71b0dedc8dd9f70b574f7f3c771326597f7ed217f1e2ff10e99e0bd
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 10504 bytes
SHA-256: 66e78e62cd6d95e306e23d61a9ffbba3052f3e4b3709ffb855549930fda380bd
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1