Malicious PDF — malware analysis report

Static analysis result for SHA-256 626892e259ab739f…

MALICIOUS

PDF

94.1 KB Created: 2021-09-18 01:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0932e2b210d014983ceeab88f3069536 SHA-1: 7b65fcea41a286288095b966e05ed00ab74c00b3 SHA-256: 626892e259ab739ff91c99ca5a1935bd7c8288bc2e846f8cea16054e346f852e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to lead users away from the current document to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crysiq.ru/uplcv?utm_term=dingtalk+fake+gps PDF link annotation
    • https://rosycaffe.com/file/65270565172.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/92568311253.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/59307047302.pdfIn PDF document text
    • https://tempegaring.com/contents/files/3784851070.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/79925913960.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/jozijizozuxi.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/kubikoko.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1b5be65b7ea088cc3582d0866bb1ec68/worapisamazagafisorexum.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/sifibekonijanomidav.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/89916430278.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/jokivafesikipomiz.pdfIn PDF document text
    • https://kede.org/userfiles/file/1939946700.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/45927351485.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wavuzufotof.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fe8e7a9c04c32d478dd0857d684b7419/wasemoxujezi.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/ropedirebipefafebalip.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/dusadogemofi.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/tiwifewogubetexinamib.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/84571239570.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161329eb79fcbc---zixizojowif.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/nikudujepa.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/64628009161.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kunolupoxabipuluxobul.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/40495059384.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/73885101335.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_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10408 bytes
SHA-256: 4ade22a95272d8e042ad56564f95a71e4ae06d6bf48345849fb94a79ee1005b0
font_01_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 18048 bytes
SHA-256: 57ae121cd9ccffad37a224d1b8ae2770f25cd0a50df2812ea823d894e1c4691f
font_02_sfnt_off000152e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1