Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4dcceb4cdd1b85…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 10:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57ba6b192105441d878850005cc39397 SHA-1: 24b51c9e55b545508fccbea9b76bea8610037ea4 SHA-256: 0a4dcceb4cdd1b858bb91a8c158cd8ed633bf244c63c7e811ad6e694eee89661
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=ivcam+webcam+android PDF link annotation
    • https://purefeeling8.com/data/file/jatuxusesowibebid.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/barupitewalirowabufotir.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/sulupofiwepoxilunusu.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/73229793768.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_212136.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/nunedateruribumozuwi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705e9ecf5---8103265617.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/tepulavem.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614599290bd80---41178584442.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210919060841.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/pomojufusegan.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/15025804996.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/55392021475.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/58104387693.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/wenaredolajatixur.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/xisodapi.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/14734893252.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5ce827d3---dutobolukej.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/37735829979.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/xapiriwa.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/rubiwedopawov.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/81035933458.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_off0000b09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 17144 bytes
SHA-256: d97df317232b4486f85c79138d9701ffbc44449482c2f87a30e982f9c7d499ed
font_02_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10460 bytes
SHA-256: 41fd3e997339aafd11099c03f50748cd9aca18e71b7593e22b45e6496c7c0703