Malicious PDF — malware analysis report

Static analysis result for SHA-256 101437ef601e6d4f…

MALICIOUS

PDF

96.5 KB Created: 2021-09-20 19:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd4b8653cf00e150547dc3c4ff8a807 SHA-1: 2794bbe0a09cb522692f2db8b0ba673b032e2e92 SHA-256: 101437ef601e6d4f85ab830e528bad34633dfb16b7db888cd7b704a7a6d1ea8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to compromised websites, suggesting a phishing or scam campaign. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=adi+kapyare+kootamani+torrent
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe55a214e---77628192121.pdf
    • https://egyptsuntours.com/userfiles/files/72406465597.pdf
    • http://cnc-soustruzeni.cz/files/file/30515307717.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/gotitijevufikiw.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/xasinajapaxe.pdf
    • https://sharks-cz.cz/images/file/nudadodi.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hfde9r84v2k3a3vsppueoo79p5/nazuzixozojawubos.pdf
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/roruzewimazisibuligu.pdf
    • http://szm.hu/userfiles/file/jizijixiduzibuj.pdf
    • http://alrehabourhome.com/userfiles/files/84599349513.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/45735243381.pdf
    • http://zamaro.cz/images/fcke_files/file/4369732025.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfc1226a089515d374bfca7668825376/3408852274.pdf
    • https://almuhja.net/ckfinder/userfiles/files/xefimowevikunumexipo.pdf
    • http://tomaszskiba.com/userfiles/file/17400439094.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/winalepin.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161335904c8ad7---54827935440.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147c7150aab3---87604995412.pdf
    • https://namhunglogistic.vn/site/files/bapifipawizes.pdf
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210903_165613.pdf
    • http://richardchong.com/userfiles/files/babanukunatupewadagepaje.pdf
    • http://ttccid.com/userfiles/files/kotokojogugujoni.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143af1a7ec21---25762886830.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc63.bin
64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 16060 bytes
font_01_sfnt_off00011179.bin
ef35efa4f473f693049852d181dbfbcc9964ead70762d4123e605cf32f74b013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 10524 bytes
font_02_sfnt_off00012969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 16792 bytes
font_03_sfnt_off0001417b.bin
73953b76d5302d95a1679f68b6a7ec3e7fb59f4c01b86545fe94a062963fabbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1417B 19332 bytes

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