Malicious PDF — malware analysis report

Static analysis result for SHA-256 0895e7629a79b145…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 03:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d21769d1eabfbdaf14d4a018ab5e16db SHA-1: 2463c2155ca4ef2818c4fc4554e44c15a7624deb SHA-256: 0895e7629a79b145798a11ec82619a9ffedf17ed2081fc9a89dd247a0912e24a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=purpura+trombocitopenica+y+no+trombocitopenica+pdf PDF link annotation
    • https://giridhareye.org/ckfinder/userfiles/files/55738211743.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf0a981eb8---74541649389.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/pomiriririrofu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8su4i4cqlprr7meggbqd3b80tr/xiwalubafuzitojuvejik.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7688501b5---35713508042.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/92270471710.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0327bcfe---jetididesape.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/86220684002.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/zubadatogoveb.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/35412597427.pdfIn PDF document text
    • https://mcsfood.com/images/file/15358566365.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6gr6f81tsik3stis8df81vrk3v/komajixezix.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3dae57a4feefb6aa29bb2199684b6fc2/70924198546.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/788a26c461794dfef13dcdc345346781/getewarigaxozeda.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/30623836001.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/kumetifasufumoxa.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ce59b4f6---xaguroputekazumibemok.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/texezagulul.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4adc79fbb---xotewag.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/zarakuv.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2ad8ea6b---68731687527.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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10924 bytes
SHA-256: d2689e21ad61e5bcfcc43cf9be99745ace3668b8342482be2fd74ceed45c28dd
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 17912 bytes
SHA-256: ba540fc88ed4259f620a4c9f9ab9f340409cb2d0904e0b8ad9c294e7c10e90ce

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