Malicious PDF — malware analysis report

Static analysis result for SHA-256 8880e5cc631f427c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 21:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fc2d200540dc08c7357178965599e5b SHA-1: 15ae8b7f8e8dfcc821ab4977fe3df03502ad5618 SHA-256: 8880e5cc631f427c32b65b1e007797cf3b6ede6aa4c31b5987d2c1560a2c4909
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a distribution mechanism for malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161331a6d4191d---maxerikomebovavufo.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f04aa7271569fc1c1df77ac8a8ce76fb/lenezodexi.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/pikuwosiwuzazapififunigex.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/8010635281.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tupotatamefudof.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ffd1677321f619dbae5a499c2ce01496/55853847129.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/saweminil.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/48947158640.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/40872403707.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/tumapimekezi.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/31697867404.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/numaribeto.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/rabidarubor.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad8286639---32708811971.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/gosexuzebijalimibaxe.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/32064287613.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/472526ff97be769ab0219282e152feb5/26905242819.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/77885362607.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/lazat.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/xenikilagabujupilagogi.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/davavasarawoxaxu.pdfIn PDF document text
    • https://priscar.com/documents/files/8216342310.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/nibazupajeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=compare+redmi+note+9+pro+and+poco+x3PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 10932 bytes
SHA-256: f287d56701127edfb59716166d1679b53179789d5021535d4a2d66169c7da3c6
font_01_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 20252 bytes
SHA-256: 1b7d76e2293c87c1d501483255f8c4cbc8bc557b26e2b06c07d955b3dd60145b
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1