Malicious PDF — malware analysis report

Static analysis result for SHA-256 0235c03b92020062…

MALICIOUS

PDF

103.1 KB Created: 2021-07-05 15:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89e7214e03859c66976da62ea5f7a5a5 SHA-1: f0c9a145edabf68bf4a67adf1f5bf6f2395e8e86 SHA-256: 0235c03b9202006229221d51ee5cc6aee68eb13423c4721261fb436179827b40
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious or phishing content. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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 http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a684f059e---69156307106.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c30d2b59d---69378708664.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/38118640053.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/r4j232gs5q1ut4um6psqkj91i4/kibupepidawaxura.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9655a9f9e63f6b61955d5c7091de0b40/74695878315.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/wagew.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/424b958cd24715ffe4f885c48f5e13f7/60455601836.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f277612064---naweladu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/19e09128cd6e34cbbbac73b1424fb25a/3984273369.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/jonazigefurura.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f249e6762---sunukumizawo.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/8887277559.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3be474e490---48451760687.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b9dd1ddf70f1ea96f727f56ad160c0d4/96235635440.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/jefixiraxubisike.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/7186889954.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c010b7a28---gaxonurime.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/kixumigeniturubafin.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/botuxivijivefoju.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/50570352797.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3d55dcc4---66226944092.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-29/20210629085340673253.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609185526e3dd---wazuveka.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833285766ae---vadapet.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/882990dc55cfbe6f892bc9437d646eaf/zigutazebozol.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/notujun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=summoners+war+rta+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 10664 bytes
SHA-256: 9fdfafbb69642c639670cf2a09979debffa6c2a11f7767144e129bb2db0f8e55
font_01_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 16816 bytes
SHA-256: 7f8e1cb1d5d9cd19cc3c839743be1225e966cf4f9f06ca11f531404b0bea3a0d
font_02_sfnt_off0001325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 21688 bytes
SHA-256: 812694fb77ee8acfedcec5c778b2f7cd7b515676a12f5af102352f0d1ccadd49
font_03_sfnt_off0001683c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1683C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18049 3464 bytes
SHA-256: ab430045ba5a94791c45c8c87ebaca6374d039af1ea5371a2a4deb0d3ff8d9be