Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a7b7eb5bb2cb85…

MALICIOUS

PDF

115.7 KB Created: 2021-07-03 06:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8b114fac0803301c98aab68feff6fb9 SHA-1: d894cc2d42edf99efae37dad386491e9abbfb5c7 SHA-256: 10a7b7eb5bb2cb85e6790c45951e1d8ecb41045302eeaf114327d4795e225219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=proofreading+activity+of+dna+polymerase PDF link annotation
    • http://schmetterlingsgaerten.de/file/68751215099.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/loresasasowilurimo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a4064bda074c4cbe8bec8ec0b8b79b29/nepafunosekiparidizuw.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/77f1c3cd8f48c9d4d782fe7786eb1484/gupibadupivalifegatuv.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/53552150238.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pinoxijuporurukujov.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94bcd6618---gixebafifiburawudalutew.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080dab5a892d---tibomifo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26f2e0ba8---bawiluriwolajex.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607968bfb6c3c---nusejojavisenefi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a238ac86d05---rananegemuje.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/624e0g53chtt17thdtljqd75tj/tedijegipoxen.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c487907854f---33313175677.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081fcbe69b8f---fadivumumi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa49ab4aa7---negivatidujogelalub.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a327015281---50294750211.pdfIn PDF document text
    • http://hevolta.com/upload/file/givugugolew.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc9795b42---dewisarogidefevimopukorek.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/28091173911.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b309b5d38---xerumerijib.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3ceb01a13b8b24e816f2560ac2bff2e5/ruwubimiwebinoraxedunewu.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/sagibeler.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/6834453205.pdfIn PDF document text
    • 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_off00015fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17801 11144 bytes
SHA-256: 3dadd7cb651ad46e6835e15b4b4b672b644ebcd8f8db9e7a3893c73fe29f83ac
font_02_sfnt_off000191d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191D7 18044 bytes
SHA-256: 3a64c210a87f22b4b4b60eec3d53b1a57469b3881459d2d61b4a769f79121711

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