Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b373b92bb41b5c…

MALICIOUS

PDF

94.5 KB Created: 2021-07-27 02:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b00a1e87a49af0b68436fd8fd1229756 SHA-1: ba12f3eb4238cc86b5173a09753b6aedf2e1ab53 SHA-256: f7b373b92bb41b5cdbed80259a94b8cd73ebb641709f9a7d56ece2f5a299e2bb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous links to compromised websites, suggesting an attempt to redirect the user to a phishing or malware download page. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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 https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7l8cmd3t2d9ujg4ndf1vf3mjkm/52500408704.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/emlfkg1ebelescr2ouq0vpaov7/zelonavo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64e2dacc0---meguvuzujajudejufaxunegu.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/70197493802.pdfIn PDF document text
    • https://ivaco.it/file/2088950100.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qkauon0du6g06pp6dmd2i5a32b/zediwenajokixunimeg.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/31d9e6cc5b24a7d6146ebf6ed999b475/88844348975.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/fiwetuguris.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/81de0673491f56c435425da0d20173aa/79080694498.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/76895906906.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/39709134220.pdfIn PDF document text
    • http://vo23.ru/upload/file/gabikezagijora.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/15378133882.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/rajavafikewimoz.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4cdf55836cff765d612546e42d184049/lanobixelavurokos.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/779eae4919ec7169cb72ee621306ada2/13428992410.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/lulivametoxiliwifis.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/84486930514.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/nosobudiponutaz.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/43744880872.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/47976934540.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/koger.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/82982ea2841ac52b9eb149432b59f0d6/dobiwolamoxewesivimorukek.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xekixe.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/bajagezufagaluna.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/fb3dcb1101fcc8953f293adc5bc75753/korabew.pdfIn PDF document text
    • https://www.drserapkIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=philosophical+foundation+of+inclusive+education+in+the+philippinesPDF 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_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 10784 bytes
SHA-256: 44b5f0595746c61381a9d076402c607a038219567be1a46d382de09a4d32d4c6
font_02_sfnt_off00013db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 17528 bytes
SHA-256: e0cdc62ddab1110c9d5800c47efa79b2534d073b0ccc4c8124f5e982c6d00002

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