Malicious PDF — malware analysis report

Static analysis result for SHA-256 6004e8f934cb02aa…

MALICIOUS

PDF

79.3 KB Created: 2021-08-23 16:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe537d7d2e1ff1d04245c16c6dbcb7c6 SHA-1: 5e623d37d027d93933a0ea1dd8a2c403beb10c84 SHA-256: 6004e8f934cb02aa70b7ae0fbb0355a396dfe291f97e24dceb57f69fd68f8109
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bioident.pl/photos_fck/file/norusibowajufolejujaw.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070308b9df86---vovubatukuzabitetil.pdfIn PDF document text
    • http://sun-eko.eu/files/file/99749257782.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/23297885871.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/75884225394.pdfIn PDF document text
    • https://dacola.com/upload/files/39964134563.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a990179d40b---xumakokakisup.pdfIn PDF document text
    • https://atl-50.com/files/file/kebimirov.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e42d9e85b3f---vabib.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/9777682359.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d01add03bf7---69846537929.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zekup.pdfIn PDF document text
    • http://canvangdientu.com/images/file/61305623529.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/zovisawumelar.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210524140740.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dd74e7d8---zutukiveganafid.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080109084666.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16106bbad492ac---44284274229.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/18194124509.pdfIn PDF document text
    • http://effektfilm.de/files/file/nakotekek.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/xepebimunaremiper.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effc11bdf1d---dagobepivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=none+of+verb+agreementPDF 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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 10436 bytes
SHA-256: 67171a71447855ede711140e309a95032f486bc0c985addbeabacb262eef2ed4
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 16188 bytes
SHA-256: 28833efa867c196e791e748940f46006ee11c04cc48bc00d8c2f1cbf6028b793