Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f23a14d447934b…

MALICIOUS

PDF

97.7 KB Created: 2021-07-22 02:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 142c706fdcec2a287d338956f2917eb2 SHA-1: e3725caa9a9664904b78d33fb704dff3e533376c SHA-256: a5f23a14d447934be834e9cc71fcc9e7ac8d5b78df4ca3fbf24111f0fd110a4c
196 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of 'cmd0km5/33389229254.pdf' in the document text, alongside URLs pointing to WordPress upload directories, indicates an attempt to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://washchienluoc.com/upload/file/655265022.pdf In PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/darokukepipab.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5tjcarqa2e60s9qv8lkvt37gb4/fosigalunifalelugo.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumedojosuxupotazalebut.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/bejiniluwovese.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/gilelotowutigagujegowudez.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/vupivar.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///modikawanupufo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e56317523148ba599b91329669bad474/25283856185.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e2188f81acdb613c426abc808ca1d4cc/16360569594.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vexobuzugefivoxerave.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/67073736141.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/l54ffc9hgfdr2cqhj5k55liv66/55224807406.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/82421441536.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/qkk5s9dj0eqpre31np1j4bsrk1/fanebedisativadap.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c0c9b0433d3d5aed8012c8967ab0d049/44217802707.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gafuforesagapivetadewov.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9dc934f8---didovovewi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/2084973615.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/64e04d6c544f1262e012a0ec66394428/gakebabigasabimigud.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7666c0a17---kamamewejoruviruxaj.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dv72ve8nkm0ptosucuccmd0km5/33389229254.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/78212184039.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nsmctpoleeptl56m9o7nl6dr08/kapukedop.pdfIn macro / runtime command snippet
    • https://12tiga.com/contents//files/64002239994.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/datagizadotidukowanagel.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=financial+statements+of+a+company+with+ratio+analysisPDF 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_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10920 bytes
SHA-256: 5d59d5d1f73ba8fdd0d768f04f1a89c97e629b378631f675be2da4ffffe9307d
font_01_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 17724 bytes
SHA-256: 81475df41e9f77a23d12a6e36bda597bd8b61c5dab135a0d83198760d3bfff58
font_02_sfnt_off00015e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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