Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76baa0fa3a414ae…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 23:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72bb5cbe32acc9aa4195e8bd95ca9c3e SHA-1: 754ada6b3e9a334e35d242e4d84dff018bc90c52 SHA-256: b76baa0fa3a414aeefc782ef16e2653bf0504a2e7ae90b2e46100c8080bd8f74
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=iron+marines+apk+full PDF link annotation
    • http://fiumevivo.it/userfiles/files/44701658514.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/toxulazibira.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c2c77e866808702a5a2240d543dfa8ea/boxodolalezejebakev.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/tixemumolapanep.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/83609988937.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/wugamijimasabutigoxupixuz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zomogerijogidusujog.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/goninek.pdfIn PDF document text
    • https://eternalbliss.net/file/wifevezojogatem.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/56762d78d59002bb13f2ed6bc9ffa459/dedorilifukamosutuzalesun.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/8621478728.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614131cdb86d7---87036477591.pdfIn PDF document text
    • http://falerisztika.hu/tmp/35496417435.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/10921399712.pdfIn PDF document text
    • https://polytex.de/sites/default/files/rokaralijepatanebowovidal.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/serabelasu.pdfIn PDF document text
    • http://wirheiraten.de/images/file/kokup.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/torinira.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/rilil.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/45633158868.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/94024230573.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gezuzonugutigarakenokumon.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dacce6ab3f8012033ac6956d2fe13d1d/99091753699.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_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 18488 bytes
SHA-256: 4ac03ad26a814f307c44f1a1f407bd2419c7d6ae514f4dd51f5914723f4fb3d6
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 10564 bytes
SHA-256: cbc8863778725f45a2fcf438f251abcb1632aa09a0342cddc3dc4108bc004589