Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe4e3eb7c32611b…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 15:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38f1faf21fd81bf291ccb12ae6bd7712 SHA-1: bdc3ab92d0f405f0e2aa96c752bcec9c04717853 SHA-256: cfe4e3eb7c32611b658a75723daf1e075a73b55af85d8e52263926c42857197a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm on potentially untrusted hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://otoozevran.com/resimler/files/48013216255.pdf
    • http://xn--e42bt3l.net/upfile/files/pagitibivaf.pdf
    • https://tepihtrava.rs//files/3072651267.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980663691f0---polebexudu.pdf
    • http://kursadowicz.pl/Upload/file/fofofexijirafog.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gatamuxodetabo.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/j2cdpa16l0j7sf0uu5uiag3ft1/garolisediwigakofiv.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/qkscgh9tc9gnnia8dboemseccf/letinilitubiwuzowureton.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/88c5039231d21d83922728fed7263379/mananisadevumefomedowe.pdf
    • http://accronline.com/userfiles/file/49764400360.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa24a73c2---54226012783.pdf
    • http://meteosputnik.ru/userfiles/file/7850092637.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24bee4051---55863887212.pdf
    • https://isosklo.cz./uploads/sanutuweduxoduwu.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lipkfhjkrn3s2fkthgdhi0qph4/meposigumalelidepefaga.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/03ec50e83445dd10250c58d044940e05/dofanejenanegujunekedojub.pdf
    • http://lycee-elm.org/userfiles/file/76384128975.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7aee0ec4---80420099647.pdf
    • http://jfac.kr/ckfinder/userfiles/files/43730894304.pdf
    • https://hssanesteban.cl/files/5268705660.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qk7runeqie5r5vgajhnmg2knt2/83527415289.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f77c04769---28696898469.pdf
    • http://hoteldazegliotorino.com/userfiles/files/nozilajalabunosakupuvu.pdf
    • https://aimhc.com/userfiles/file/6508519073.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/k6iaqhhkktn5kcg6vlufrsefoi/kijekakamadirajobigoli.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afc33d4bdac---79720312270.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=definition+of+capacious
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9e.bin
41b04e1bb652bf182987682841a2152b2d53879f661e41e6a8739a63fc0b2a16
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 10428 bytes
font_01_sfnt_off0000f568.bin
43d0395fee28893cd906ea1ca0c5fd2ae1497e931a4fbbbb2379f52cca910222
pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 18556 bytes
font_02_sfnt_off000125fa.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16060 bytes
font_03_sfnt_off00013b0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 16792 bytes