Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6889ba3c83b24d4…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 14:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4d60521756933c861c8aedb64e758ae0 SHA-1: 564053361c019dce3fb1f0336659bdc1faad4664 SHA-256: a6889ba3c83b24d4e6e377daca235ed1348d0246349f0006f6f1a2394a388b51
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by a machine learning classifier as malicious. The 'SE_CLICKFIX' heuristic indicates it employs social engineering to prompt the user to press Win+R or paste a command, a common technique to bypass macro restrictions and execute arbitrary code. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a link farm designed to host and distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4b1d21882d62e75e246f3ca0e86ceaf5/29684736094.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a804c05f---18565482612.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/zefusedebej.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/04b7144377ed3c1ff7dfc1a2d2ae9dfc/88004144192.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/59309262629.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/65c5601dcd4af600d643f086aa1334b4/wonunedutetixufa.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/jenozufazusiselidogataba.pdfIn PDF document text
    • https://soechi.id/userfiles/file/kovuxalida.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078710d68c89---fexexinepox.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/52959566395.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0b63857f48ee5bb9d940f0914887c93e/kifogimunokepagi.pdfIn PDF document text
    • http://unsersohn.ch/images/file/lojupofakejekutexakobega.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/91225936683.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ca011fc3b27554eb97cfaab7f953a690/67353836603.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/34811313289.pdfIn PDF document text
    • https://andrejc.si/files/file/70266715982.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fhotsc7tmuhq4ln7i4fveh1aie/mipigugetutepozanosiso.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9d6556388---jutidajujipomujemibojum.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97969426669.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/goxujudikelarazufepute.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7c47a703.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/43027525530.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/99212450344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bigger+chests+modPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 10560 bytes
SHA-256: 17e5d05e6f6f66e3666ddffb38bbccf5201556f3fd6d0ae67d13ecfb937f4265
font_02_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 16960 bytes
SHA-256: f0463403bbe624d3b17dc76e4f69db8463ae20c75e2cc3b7c88fdcac12a6a1dd
font_03_sfnt_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16

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