Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d57da99e0deeca…

MALICIOUS

PDF

161.2 KB Created: 2021-06-28 01:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b7d20739f3081b13f779734450f0f90 SHA-1: 942bdab1f975bb2f9f9b62bd678d9667a7746210 SHA-256: f7d57da99e0deeca86f75bf0178704ff6f19356f25cab21604346f7a2775526c
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it's designed to lead users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and link farm behavior indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9561

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://moscowfashion.net/content/xuploadimages/file/kinutupetojavosivijezazu.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2ec435f0---guxatenovezurebudegaratos.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9590293fac---kobejojeripolilamofujazon.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c916281a4---gelakizemom.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/91890516213.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/60131877314.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bf89a1372222940494d975d7eb406146/nalijemogozuluguv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607847cc73ba8---93524459096.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pejukip.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/58530869606.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/lexejiruxap.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/97029997483.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5r6d04vj6mrt5ono49o12a56h0/31417650539.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607395f01288f---52366046976.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9f2658756799d4ee151e481c4ce42465/13790915810.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/218a6021371328787faeb4747ec1b6c6/64517080913.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf5edfcfb---buzesi.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/95738482966.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/881b0aabe798b13a331947886705d38f/98673187497.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/g1ksfr0pqu7n614sd29a25mtn6/dugali.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc170f719---zaxog.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/vabumipuxazudiximanajize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rf+pager+rustPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/radav.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2039A 24272 bytes
SHA-256: 8e940039ecbcb45444e8a1eb2c2ff0febfcf501566e963d01f1c9e8e09fba710
font_02_sfnt_off00024042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24042 16520 bytes
SHA-256: 17dab69886bbd3ec2a6b7f0b1d65c3601f0d4afd9e3fe3dca6a26fc3206f9cfe
font_03_sfnt_off000256c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256C6 10316 bytes
SHA-256: a7098faac9d058c4207507679f2350d6c152faa3050492c8b4b68081e5655b07
font_04_sfnt_off00026e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26E29 1720 bytes
SHA-256: 9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073

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