Malicious PDF — malware analysis report

Static analysis result for SHA-256 a395fbfd34e28530…

MALICIOUS

PDF

97.9 KB Created: 2021-08-07 18:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e1f16b6bfd3c580f004585f8e35a7b7 SHA-1: 0b20d76cc7204ffee528d6d87bf265f15b4621ef SHA-256: a395fbfd34e28530f371121b4342c68bfaa547001c22c9cdc14607c2eb0d019b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URI heuristics and compromised CMS upload links supports this assessment.

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://lesen-und-schenken.de/userfiles/files/30904105378.pdf In PDF document text
    • https://lotteppta.com/beta/assets/file/38512579878.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebde7add1d---sepozawanimojek.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c739ce99829---gidipanikirur.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0baa43a371---14027419441.pdfIn PDF document text
    • https://noddy.nu/images/file/83530179271.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/gezisujaduxifutuzuvexewol.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f334b5421ab---rizaburejaduzosa.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/jilexe.pdfIn PDF document text
    • http://annabarons.lv/files/files/puxinexututowato.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/52126001993.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/bedelinizudigomo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7f553460d5100d8d897200fef021d380/42010896082.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/25200451398.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/86087360744.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/31e9aca7c42fcf909521149c92186ebb/1458715621.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xudijupufodolofiwad.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/kbnt9vl0q9tdaumkkmpjm8ntc5/mugaboteruv.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210528234202.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/19996d803d02290713290bf820bbe5cd/65250725591.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/rabikekisesosiduvino.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/19729944287.pdfIn PDF document text
    • https://studiorampinelli.com/file/gukapulidajadasizo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4744537392---raremujalulenegoz.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/duxubonuwamewat.pdfIn PDF document text
    • http://fygl.net/uploads/file/222042331501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=is+zeus+on+xfinityPDF 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_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 17952 bytes
SHA-256: e2c47772544fb9fbe7de370cbac00913a620f175aed7bd080b7e374d60e449dc
font_02_sfnt_off000162af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AF 10228 bytes
SHA-256: cfaa0e4800e679d466585b779aed0f5144fa34eda22d93741c855fdd34f9af41