Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a1df38d001409a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 12:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 097b846ea32842138682f82bdea295b1 SHA-1: c4dba8502a822f20f1c2cdd3fc55e4ebf7c20222 SHA-256: 01a1df38d001409a87ebf8740caf625bd92e098601edf86ec16b311aac174d79
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68b7c84e6---nedolubaruteluxolede.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613319bf30afd---femiwojinonigazitak.pdf
    • http://mayinmaunhat.com/upload/files/15531160864.pdf
    • https://giverny-bkk.com/upload/files/zofipoxogex.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/poxajixoduporubured.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5ea5f079b8c30837fe61c0c2179fcf9b/73955829685.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/bijetorexatilefig.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/vedasij.pdf
    • http://sushi-belovo.ru/files/podarotamubodepoput.pdf
    • http://colorfulmedia.de/fotki/fotki/file/55839010951.pdf
    • http://lamekatus.com/uploads/ckeditor/files/mivimuxubasomiwuso.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/xikixikagokodewavadodad.pdf
    • http://nebovsem.ru/app/webroot/files/files/82629590755.pdf
    • http://www.pranabkumar.com/fckimages/file/54802753934.pdf
    • http://clearspace-design.com/CKEdit/upload/files/sujuxelukegu.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuwujemez.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/zitulomifo.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vatarepazenabidudajedunas.pdf
    • http://daydreamspin.com/userfiles/file/43510622604.pdf
    • http://gekon.net/userfiles/file/33845742946.pdf
    • http://deepakbatteries.com/uploads/file/75670734916.pdf
    • https://esterkins.de/ckfinder/userfiles/files/13497838740.pdf
    • http://casier-a-bouteilles.fr/file/17349018440.pdf
    • https://magicdiscoradio.com/userfiles/file/82763635896.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sim+tool+app
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 16792 bytes
font_01_sfnt_off0000f3d3.bin
ccbcfe372954f03a67d9dcc2e8e506dafa9fe7348d26441921292e3883bd4005
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 9984 bytes
font_02_sfnt_off000109f1.bin
938de8bdde98c860e77bf04e122fe8946c31c1268e3da2d92389582a51c26781
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 17208 bytes