Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1dfd2760440d32…

MALICIOUS

PDF

136.6 KB Created: 2021-06-29 11:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e032a91871ce9583a7938b5c969d5cb SHA-1: 77f9bf498a101eeb885fefa04e46a192fe856869 SHA-256: 1c1dfd2760440d32a7021e7b11aef98f7de0def6576e9b1ff4b9920556716fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 https://crewmak.ru/uplcv?utm_term=i+feel+guilty+and+anxious+all+the+time
    • http://quangcaosms.org/media/ftp/file/wekozuvezebejarojebe.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b520a092f---jomejukusosapubodarolad.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c06adf30---sigituruludupivogegumeza.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968fcc266a2---18534280228.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47c1c2ef30---25781226522.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c93c1f85265---33283339618.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f0f2566e---vodoj.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/bezirugazovadapapizol.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf58b6734---74391623476.pdf
    • https://n-zvuk.ru/upload/file/1429334826.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4077ab27b431c26659eb694f46fc54cb/50554543924.pdf
    • https://istanajpdua.com/contents//files/93688937006.pdf
    • https://bustotoronto.com/userfiles/file/1111033638.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c0b1186fd---1679356895.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0d7e2b8e4e65801ef3ff46187e0d0f72/9218659289.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15250299f---45116386803.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d5f6599e---vutazib.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/34ae79c0f5811f35297a86d1b031d372/polosusekolevetoteretane.pdf
    • http://meteosputnik.ru/userfiles/file/kezuginaluxekopij.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/komovazarotudipa.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95b71d595---regigimolijubofifukatipag.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8646e688644a2cf7fac0a534274799e0/xaragawekuvato.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/63179288583.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a699953a92---71630050293.pdf
    • https://baobihungphu.com/media/ftp/file/81870840209.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/34611999118.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b655.bin
b665149d29858f856fe98c6998c24f1bb6c58ec21318adea4b370f7694fa893c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B655 17324 bytes
font_01_sfnt_off0001e35b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E35B 16792 bytes
font_02_sfnt_off0001fb72.bin
00e0bb621f4abba264da3f44fb22fe21b053466183455dcf8200194ad49e00e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB72 10968 bytes