Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cc3587a61f0905…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 18:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9ed70254b64be24118329b68410dd9f SHA-1: 1379b3880364d561fad4dd3bcef5379db217aaf5 SHA-256: e5cc3587a61f0905a9e447b8ccc9de87dfcf6757a65174610bed2eda62423d01
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution vector.

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 http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/4490577377.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a554449605dd69e213a3074a2becd233/teviwedevalu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/b1f64d52fd9b2c74a8b0cf94b4fb4680/63378344054.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/f1dc9dd821973388858b599575bd94d0/jofikipebufilokewijoz.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/vijagedop.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/wifez.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c37e169504---mutemetoxalafunute.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/94f43089f2f73f8bab523efca68d78ba/81370208418.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70242d83a---pevekoradixan.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/sulix.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/24cf0bf265b0118c2ef9bae0beebdb15/pufitoviteviwefi.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/nelitodabido.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xugovunubewed.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xesemopexekajoni.pdfIn PDF document text
    • http://maihome.hu/admin1/file/pifabexijibifatuti.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df1dc7df0---nipejutomefogusavupiras.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/25590600549.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/78018491715.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88d48edb85---5461587368.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hdgfjg0m1qupteal84564n3jat/tenekapuvadimudamotavovu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mfv1m2f950h84pn02ihh90rfb5/2582117056.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca3a9c7dd---dezaxe.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/a1s2carjksa8t9lotil1pbr390/runopipode.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/40163472110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=glowworm+betacom+3+24c+manualPDF 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 18396 bytes
SHA-256: f6ae3628f39f83a2a36d658399e3a2374e847bb202f64ac94286ee4f06043e08
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10868 bytes
SHA-256: d6f04a478a2e952ef19d66c1d185f4527764a618f503a47c97c95a5d00d2aa2d