Malicious PDF — malware analysis report

Static analysis result for SHA-256 401034c3da727886…

MALICIOUS

PDF

90.9 KB Created: 2021-08-11 23:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18789988bc56796e2f0289e759abd781 SHA-1: 19c295af7af7930a25f5c443b826274bb571cec2 SHA-256: 401034c3da7278863cb24086cc67f89852c3054df2471a7693c3dd5acd19f08a
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URIs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and numerous links are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://allytemp.ru/uplcv?utm_term=biblical+boy+names+and+meanings+starting+with+a PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2e7f1a4a34db8507e17a23aae238fab4/54272505509.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/nuzup.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/71392464501.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080130f39550---67490518012.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5cd1019d3afd16d962645688b33a1f19/pazedapotunisakurapinap.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7e77b8873a36735474dfe58f6e6fa6cc/48357997284.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca68ef0c9---witogof.pdfIn PDF document text
    • https://norservis.com/files/files/825222811.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095578f8f3eb---52712334912.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7cf2400a0f128a4ad4c4df535aa16814/14377771073.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/61379350973.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4994bdd3bfcff96154886f3ad1fa6a31/1999360028.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/xidofitoz.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/8527334359.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/piwagutubavakavepisibevor.pdfIn PDF document text
    • http://midel.me/userfiles/file/kutatagaf.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8rmoptbgvqme5bas76mr43j3a0/mozufinixategatedaniloxo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/vituxefejeti.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca42c7b5b---fobaza.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d2d58c47---samezatidoji.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/nudetuforob.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/2358130415.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/suvipakajezobuzabejodez.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/20668017499.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821d620a32a---tenewotumewivadajore.pdfPDF link annotation
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/133c96891676e639cac7247974bd0828/fojofolezunukakaji.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/s59340tumobg47pi5bm7tem2b8/vodepexod.pdfIn PDF document text
    • 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_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 17456 bytes
SHA-256: 6a61d51a028a9afabd46263f46e91690e95d56cf8c27e35bbb68c13fd05f00e4
font_01_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 11212 bytes
SHA-256: 1a61235164b9ac80dc7681f74f0c68f92fb47be15e1c76217389c33013d9025f
font_02_sfnt_off000144c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1