Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3072f77b2381be6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 10:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6afd3b34badac1b031e1110b779063b1 SHA-1: 333067e48676e1c5c772a13ea85db1bdb315fc55 SHA-256: f3072f77b2381be6be82bd84d12f15f5cdeb09dd52ba372833d0b7246581af2f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, with many distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The PDF itself contains no readable content, but the embedded URLs point to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f89dad0db2b0c3a0885e79a8af1f01c0/fimikefubatotubevuje.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1b14993753548f27766e1cbff9d6af2b/19532309156.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f159663d---vavopexiroturuluzuwusa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee0754f8d---20497386258.pdfIn PDF document text
    • http://teraval.cz/res/file/sigomululatagovoni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c318a7ce912---wokaxa.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/81791346447.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c956328383---garupawilusodujogijonux.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/duxodokidudo.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d8pqv4fndh4jgcjgce7pktnahp/savafukupeguxefoxipe.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/55480258841.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a62cee507---43968791079.pdfIn PDF document text
    • http://salt17.com/userfiles/files/35730927235.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/241cc86acefa3f36a7e346b10038c0d9/54941050867.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/89485851953.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/36e673676de6175b825b2b8a03847be0/96351602143.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/digirebekutinawiz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e9dd4b99---78234558308.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/35405607542.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/2839973700.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/29387406595.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f807e65f5---fogaxopoguxaropadib.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca85cfcdf66---zeluwaleverutopotifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=srs+lung+cancerPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 16076 bytes
SHA-256: 1f6cebb8b2684774b23676449c7780d77b401ac9b867bf3d90c6f32eeab29940
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10272 bytes
SHA-256: 6113d3164dbb3df391df29b328e3d34b5570fff4304200df2c303c3f7adaa4af

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