Malicious PDF — malware analysis report

Static analysis result for SHA-256 126b6142811ba853…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 14:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba3372c6106fda8660240fc048ae04d4 SHA-1: ec14c29be4bb14e5bccc334f9ec179a46a3e55b1 SHA-256: 126b6142811ba853aaccd3d13e79c81c3e87743e9a1db75f47eab29a0110604a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a 'utm_term' parameter in one URL indicates tracking, common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://synerhu.ru/uplcv?utm_term=malang+full+movie+online PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/81545676480.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tatotogedixawemoz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161446b68e7e8a---64746566987.pdfIn PDF document text
    • http://polletnv.be/uploads/files/75278945078.pdfIn PDF document text
    • https://resicolor.com/upload/files/kaforudawigesetolajo.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/puwufexizobukurezamu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a59e8e24---fadumanotolukekagitezige.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/97427758265.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/41964455528.pdfIn PDF document text
    • http://halmar.info/userfiles/file/13312089403.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/mokagoxepobaxowozigoza.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/nibed.pdfIn PDF document text
    • https://gdaniec.com/upload/files/novumawuxi.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/4728384180.pdfIn PDF document text
    • http://ymmicro.com/files/files/lodikeduluxuruxigisuza.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/16673413040.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/nexumapotazupifiw.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/38923736974.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/wokosawivezolaloramo.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/memevevofuvanuvi.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/lavozakavinanas.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/vobatomulux.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/mukiwim.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/buwirumudilutoru.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/wabad.pdfIn PDF document text
    • 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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 10352 bytes
SHA-256: de1576b9bee29825387fd4f3a10b90bd611ca1cb73e7fa20648c0fcc8fd63b40
font_02_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 16772 bytes
SHA-256: 6ef2e415edd5dc7a3b6f03f9dbdf9f973db1a47b819fddbf61a0b15df1a5be7b

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