Malicious PDF — malware analysis report

Static analysis result for SHA-256 841b181cccc344a9…

MALICIOUS

PDF

101.6 KB Created: 2021-07-07 17:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f35937dd78477c3025af8389e95fef7f SHA-1: 87fa95a0477e51e750e6c9104d663920298ea2ff SHA-256: 841b181cccc344a92683f670ba8d7d4a37d844fb4145d4e8a9cf56cd153c7e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/dc1e6b4f473ddcc2b6231e4bb6651916/13937806775.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qanutq777fo7gbb3vv105d3a36/35532668683.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oqfkujk8u4tbss3blg81n88ee4/puvokesoterifijalo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/zasaxaferevonisevimon.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rvakpmbastanaa2th9gb0i4qg3/demedebebefunemud.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06609112b---tiwizerixunotulobowew.pdfIn PDF document text
    • http://tfforming.ru/d/files/ganejivutu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/buzowozenitoguvobaki.pdfIn PDF document text
    • http://classtool.info/upload/files/vaxuja.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/76a7vadprri2f2qcq9e2l1ea55/26277576203.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/87286091132.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec45fe19b6---mokatuf.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/44180171324.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/duwudabip.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/41652346795.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1a48ffdebb9afd59552f4afc402b69b3/wekeberofo.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/zitanuwowarividozuravezu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ea9a44e9c01f193d920cf8d56b2facca/71480555203.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2628ca84e1---bamanadew.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/bukazaj.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/4qh9cvu5ns0d8eo4j6mqeg0vcb/8952856394.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c102e709---36346821388.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/21259531760.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///75825769185.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/juxolodavapufavipiw.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/98516418218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=meaning+of+cain+and+abelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013654.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13654 18476 bytes
SHA-256: a1d596c8b47d6302bb290ba259e137e03e39ae9dd4b8d38b46b1f4fd77294ef0
font_00_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 10420 bytes
SHA-256: 8a063989aa2a2374d7982a1430b374f9a096a09cd72a7980fcd6334e79c8617d
font_03_sfnt_off00015436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15436 20600 bytes
SHA-256: 8b6c3fe2aa024ee04163c03945d231677f52f26d6b1b160e99beed058e1f3dee