Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1dd4e39b48e62f…

MALICIOUS

PDF

76.3 KB Created: 2021-05-13 04:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66e2137ce8865401f9cef64398018877 SHA-1: f9050beea2cfe1802281db101951dff64ac34d1b SHA-256: 7a1dd4e39b48e62fe7c74f182d40f9a73f596699faa498807f199e0eea9d8904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The document body, though partially garbled, appears to be a lure related to 'labor risks', likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://oniceh.ru/uplcv?utm_term=que+es+el+riesgo+laboral+pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10d0e55ba---94549100973.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ce523a5c340d51f0482d5c88bf9eab9/vajidubefa.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cc1e00ca7b2d5805f01f41bf27583900/67415410882.pdf
    • https://circolodelpistone.ch/userfiles/file/labokonafisexisexu.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41df3a26f9ff1b81419855d4777455d5/93066811932.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869540d5a04---rawaka.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8anum8tvkhfr3rbh42r38e1v6/96718364149.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ec30f04---27857608779.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/372ev3rnh8fu676d55d0i6r4gt/bigefemiwiranilese.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aadf1ed519---34561766855.pdf
    • http://auxerretv.com/content/public/file/75209826367.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/io7tl4juarp1n7hdcvhqcgpua6/88420657942.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7056386008cc262688b1a7c8a7f5d500/rivuwavimowofifefoxaruwar.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/392e4h76hva4mava5m3qae7lm0/nawuxizelusavekadub.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64e2ae436---munuguwomebowudi.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72e6ebdc5---nurapivinuxedabove.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3ac48565---38042475972.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/96520965f80dd186c7488dea5eec771a/zifenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedb.bin
1e65338f2cc46ad63531ec6b0babc07241326cdd9e3d2bd52a5f3d0d79b8c7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 5108 bytes
font_01_sfnt_off0000f03e.bin
b6fc5b0dcac8bd5a39ffe8fd63e82facb720f8bcb07b2e2b703a55dd4329557d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 11484 bytes
font_02_sfnt_off00011597.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 4324 bytes