Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f53911ae61f8365…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 20:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6218d07d8365bf5baff81714be63ffdb SHA-1: a2cefee7bbd133f9cdbaa619c96947830bcfcccf SHA-256: 8f53911ae61f83659474d8cba379f5562ef9219f1ebe5ded245381ff7c6d7e03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of urgency lures further supports a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=home+birth+midwife PDF link annotation
    • https://villanakarin.com/userfiles/files/4656396047.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e24c78d0d84---xisixobusafo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608750cb4bc21---kitujewofofi.pdfIn PDF document text
    • https://istanajp2.com/contents//files/mokidezuxuka.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/nutetogi.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/4701634088.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71717871d7---nejuv.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/refelegumelilu.pdfIn PDF document text
    • http://pi-consulting.ch/download/89394397063.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/94395484079.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/vanaxekovivuxuw.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210624081536.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec0cba2d9---4370958702.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/17360285542.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c59d995fc---voninoguxiper.pdfIn PDF document text
    • http://alkanboya.com/files/file///24091267261.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b097ebeb10---55183346642.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ketolofamamuvo.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jozokidije.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/nodukisigi.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/19676901782.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e82c579d64---rakuwidimi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 17536 bytes
SHA-256: 6910d1d2f381a2742e44eda8e61081e485a15308f97d65981ad2d40cf40ed224
font_02_sfnt_off000138e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 10356 bytes
SHA-256: d390027dfee3d714628ca703803174728a82c51c8b48554e7b3d3e9b25912733

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