Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9374329abcabb24…

MALICIOUS

PDF

110.5 KB Created: 2021-08-11 13:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50cfe07e7c5a911503c0ca90aeaa4f64 SHA-1: 597f5ba099b7581d9b1806e610f19b2aa1836d26 SHA-256: f9374329abcabb24d4b8595e3197577e1933a44bad91d3b56f288814a8ada7f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to malicious content, likely as part of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=notas+para+piano+cristianas PDF link annotation
    • http://www.adarshvidhyasankul.org/userfilesfile/94978651959.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/eukmdcn5974k18vpbbqfb3ih9g/59942330267.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84b07b6fbf---vibunapekivub.pdfIn PDF document text
    • https://invest.pl/userfiles/file/71024817504.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d4717456ca2b3b3b4178b3271eb9d0ee/74620614134.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0neiqin3r9dcmsd8kmudlcg3ru/46369784733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873aeb565e5---balivujogugusiganagu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ad97d5546fb550039575b976ad1256d6/83732659224.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e4fef3851---suvutodo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea1110c0e---31733800789.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/saxetapinunonaku.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/42746459830.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/vanedipaz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe2b4501df---luretapobirodegujepav.pdfIn PDF document text
    • https://bselink.com/userfiles/file/77874180365.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/99733486913.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/naxusakumexa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ff6a63bc5---gegutazigelekidikoz.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/miwivalinuzugub.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4bdc0d6f3a1616dee96725a9dfbb0252/47728025479.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/68832413588.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f984320dbb---rekenufed.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

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_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 10168 bytes
SHA-256: c1d7ee85d6e3ed3cb9b0d85854c71c2e44a0b16bd236f4e64825c3b7ef13502c
font_01_sfnt_off0001487c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487C 20272 bytes
SHA-256: edf242fc43978c3f25fdfa27932db0e423117450fbd0631742fa6e499b771146
font_02_sfnt_off00017b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001933b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1933B 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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