Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbabc317cffdfcbf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 05:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d602be80d1f0f0dc1e4949e258a0f31 SHA-1: e8d36e4976e92665aa57d99dfa63bd1043868006 SHA-256: fbabc317cffdfcbfc02ee3d2dabc284e31ad9922fd925ce521812f12568ca0d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which are associated with compromised WordPress uploads, suggests an attempt to obscure the final malicious destination and distribute payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614250d50c83e---lufof.pdf In PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/vutisin.pdfIn PDF document text
    • http://cartopack.be/Images/file/97676812597.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/numevubufebiwedeb.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef1272005---85392967964.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/67438357910.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/61290399591.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/merapatumusufe.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/wimidupix.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/56413398283.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/29934381825.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/50614695473.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/22011637903.pdfIn PDF document text
    • https://lazerom.pro/media/file/wurawupaferixejom.pdfIn PDF document text
    • https://onlinendttraining.com/files/parizepaj.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/gemabowaduzaropesalasuf.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/40837508368.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/30769096985.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/mananobimosadagesogowawo.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/47583599696.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/22853924046.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/vozefuxifuxivaxerupikewob.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/80157662288.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/34114508883.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/gidobokerufefasiv.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613983c66ad2a---80443845256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tizen+store+app+free+downloadPDF link annotation
    • 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_off0000bcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBD 15908 bytes
SHA-256: be0beb7e1382cc4c26d84f6bd8085dba65e6bd23a7669f61b044b6c4cfcacc14
font_01_sfnt_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 10600 bytes
SHA-256: 7bdced62e46392efdd7703cb0fa48871abf68e81bee6f2b0ee3540d0b6c6da3f

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