Malicious PDF — malware analysis report

Static analysis result for SHA-256 4315f8ff44a32f95…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 12:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bc7c174023ef91fee1da0b6d62cb2fb SHA-1: cc1422e861312379b698d6e7edf9ef65e7a0186a SHA-256: 4315f8ff44a32f9587b42066c6b83fcb70c65abaec235f76dbfdc4039d0214ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/b4ov8re406jp9kpsarvm7g3aeh/64314172042.pdf
    • https://condominiovillage.com/userfiles/file/43641872715.pdf
    • http://ahkjt.com/upfile/file/xinurigepozamukow.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e77je33vodghrsrnsffjsfu8a6/83208596546.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/43ab31c947c3b0a251a6e84eb4e04055/11822187343.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf3251881---remepizareduvavu.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f76eb7f3---notulilawujugejadef.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16aa70daac---retijijekavajasufabife.pdf
    • https://naoshima-habitant.com/lejizokawokasuzuvig.pdf
    • http://bungefamily.com/clients/5233/File/valubenibujote.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/61c412a359bc8af05598e20690b5325d/loxafitejufopukigo.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/37956820154.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160706af17b5a9---wedonugabupunefowaxadufes.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5ef75cec---35924505123.pdf
    • http://akvatoria.by/UserFiles/files/50438199400.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9021df1ad---tirapakigejenafesigakesoj.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089749b33e0e---87988484317.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/4099697756.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/o5o2artijmsfu6odknda3jmj6k/jiwobuduv.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/59f4a470d4086808bf179e07846f9c8e.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160851386c9ce4---jademilasalaxedovazufaset.pdf
    • http://lucann.com/Upload/file/13939456916.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917ac4acb26---45816035293.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a93145c088815e5e8784867d344e16c/xonukedulelebo.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f1b2b9c1---fepezelalitiwuvivo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=council+of+trent+baptism
    • 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_off0000ff16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
font_01_sfnt_off0001172d.bin
50e178194e13fea5288735ecca8ad9ee6ad1ce93dc0d159c15f2251a7e0307e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10912 bytes
font_02_sfnt_off0001303f.bin
88b9a186f87c7f74467d0080d0b5f0cb208ac5292a5060a96abe7a6eb144e1d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1303F 16884 bytes