Malicious PDF — malware analysis report

Static analysis result for SHA-256 08488e244afedbed…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 22:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f40cf99b53d70b66fff4d43c7269536 SHA-1: a2557cfff9ec9e3c09860426bfdcbf72561131ec SHA-256: 08488e244afedbedfe525256ea2f89f1ddd61304b47e2c69a0b81b8ed75dbf1e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a lure to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59d770281---sezupojujarisodipipuse.pdf In PDF document text
    • https://lamthong-marchph.com/piceditor/file/wigape.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gajibadigabere.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wufafupovafesi.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/detil.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/dexulevabanulu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f842881c---41013584962.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/jerukusifudafu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757f50a92c0---wimaxewituzazesagam.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nijuje.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94a25b522---lilen.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/midutagesobuwuru.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/247fhi2neblro3apdpivqrqfeo/25271151019.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ed036fdb---wegevamigidarerebumugi.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/7809306117.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/tumewojadiz.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/bujorilidigufogivibalovak.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/xekapuxesixefaniner.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/49e6fdc39e57db972d17702bd2e69078/21546798277.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3005c568a5---14358900630.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k1omaj3n7epink4634vufkcia2/zuram.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c7171474---gigojajeki.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/455802716.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/40296539423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+edit+scanned+pdf+documents+with+ocr+converterPDF 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_off0000b789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB789 15492 bytes
SHA-256: 0d41abf22afd0257de28d30c54e65203b376ba2124dbe9116f1542253b6f7696
font_01_sfnt_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 11084 bytes
SHA-256: f3b6dfda398b6edc431d235ea805582ced78e9d895197edf40c2327d42db3ce6
font_02_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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