Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c25b289300320e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 04:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2b748e3659523f54cf469e37e9a11fa SHA-1: 25ef21486bd73af7f750ce9b8d21dbfe865d8514 SHA-256: 56c25b289300320e6cc8454c9c94423ea357da4a12a5a1152c0b66af425fffc3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://modnyi-buket.ru/uploads/files/pusifivedod.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d4682913f0---fulazevanojajipusos.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/87167263268.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/bovuzulotofuduwe.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1acea1b7c9---38742404104.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5a5b7eb9---lepadibizeri.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/42865470799.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086661509c39---88551045851.pdfIn PDF document text
    • http://0048.pl/48files/file/63606638242.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3bf2b0bd93768115afbfacd9495850f7/gebugegutulunofedajo.pdfIn PDF document text
    • http://z500.si/files/87138295343.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7d4359c0---88599791868.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/lavegadaba.pdfIn PDF document text
    • http://108homed.com/userfiles/files/nalofif.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/xibonisoxigasigevupit.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/tivekabanurek.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/rikid.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc2d19d52---25717547588.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/396377305.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/mivinajexevavojo.pdfIn PDF document text
    • https://doitoutdoorz.com/file/arMF9fQ9kxIh4Jcg.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/pasamosinoxuginilumegu.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/45498273862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=maths+questions+for+5+year+olds+pdfPDF 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 11084 bytes
SHA-256: 73a370f27a2d94257091e6bc30f93c04e0b9e8c95443a41a06b2733b7c4dde42
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 18112 bytes
SHA-256: b2afbec7279ec4a6d49e452afb5ccdee6029c18bad31224e36f00df59277f911
font_02_sfnt_off000128d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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