Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a5fec58b557dec…

MALICIOUS

PDF

89.7 KB Created: 2021-07-08 01:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56bcf1cd5cf2f96b594a4f8618c1768c SHA-1: acaf420b544458fd33f36330d3f620c7938311e4 SHA-256: b0a5fec58b557dec923c98822bdb93b6f42272f97a0993f93e16ceef18f2f1a4
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF itself does not contain readable content, but the heuristics strongly indicate it functions as a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f56e00e729ce435ce27ee09bca221f7/94348948997.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa8bb98b4---wodevovezokeriwaguvurolu.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/90b5a3ec5d927044354b9cb453948e95/supimoxo.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lm4o9naekr1lnqar7iirmnapdf/ropuveburiw.pdf
    • http://adamlegal.com/userfiles/file/rawuvorarivuwumurovuf.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d950113d1---21938567871.pdf
    • https://egyptsuntours.com/userfiles/files/60220340035.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f78183c9e86227b73c153f21eb866599/24871156455.pdf
    • http://royalwedding.jp/images/blog//file/99324474671.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5k0116d83j1n6pvsugacgm9nef/25228199630.pdf
    • http://soupworld.de/upload/file/gijesajaxeruzige.pdf
    • http://soupworld.de/upload/file/wuperawaw.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c157a927b7---48893430104.pdf
    • http://brandnewgoods.net/userfiles/file/41136028387.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdaf6dc7c---93007983805.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081419181f26---97108275534.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160deb72403c85---fepuziluverifulawupuwoti.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca63b3823---vekovopuwavisopur.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4312120b7---wobojizajutuvajorit.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51767979---74170955198.pdf
    • http://chiengthai.com/file_media/file_image/file/62955144936.pdf
    • http://webbuilders.com/files/file/23885348882.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ea322dd2---lubejexajadorazalalugadil.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/447e0921f362085abb0e5dca9601956e/nanobelapoxodirevepetalo.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/85c3061fbca0cb04f660041508ae34ea/birazunozefaza.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/d091oc8a18abs9nrp43kis4vmv/regukokapoxug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fist+of+legend
    • 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_off0000f2c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 16792 bytes
font_01_sfnt_off00010ad0.bin
cb8d8ef53bdc57a5cd2efb066eadae7c73914c5dbfabc85346e759e18df89519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 2240 bytes
font_02_sfnt_off0001149b.bin
49df775b8e5d66ce7e2404c4714fd35fc6d51b3b8a01cc333fe967dc5e4bc0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 17316 bytes
font_03_sfnt_off0001422f.bin
5fe6fab115ce5c5da1c01864f65f9aa8d3a715921c112af561c4b4a31c1973a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 10244 bytes

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