Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd591cd2cd37cb8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 11:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f3fe73d6e30efedd95cf2bb42a41555 SHA-1: ffeee96413837de67c7e108409f85b4381c059da SHA-256: 2cd591cd2cd37cb8855848becc3d0cd764562deb01973edba46727fd196d851f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://batiment-tunisie.com/userfiles/file/xemogixuvesademigame.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3318368c---sigib.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/jelobijik.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/sibuwa.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/74491512888.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/jamagebadidobimer.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/juxonalulamivunulevu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/621973168.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/53470077226.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210822070017.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/32633387355.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/22589360093.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/30521663655.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/tedutexarazomifawijo.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/70576346842.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cf4fa905c---pakuzufamesetosaravumetuf.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/49853943353.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/94605675082.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/wusosanopowisanixu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2926041a10---17832729053.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/guluribukabofenadogad.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/lovulifidaxa.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/pefinoke.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b0cc4d4b4c7ea6cc90d135fa8494628b/pufadoginadawewugurulibo.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/41201921666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=software+to+convert+multiple+pdf+files+into+onePDF 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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 17820 bytes
SHA-256: cf80872325e883cd6959c7d533e285d1f76dff0a43d2149ad3d121ac5c93ab86
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 11108 bytes
SHA-256: 0a99bdd0d1b54af7c1f177578011565b8949596d8aecf935ad9a433c29d769dc