Malicious PDF — malware analysis report

Static analysis result for SHA-256 e917532f71b2d404…

MALICIOUS

PDF

135.5 KB Created: 2021-07-08 10:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b89a051170a375955dea9b096fa0f39c SHA-1: 807e6c5eb341c4a94b2980bcf54ffc16461749d6 SHA-256: e917532f71b2d404f13229d8584605441a3ef6ae2aee594d7cc5d5817024c048
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct compromised domains and the use of UTM parameters in some URLs further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ofnqioh0m1d54n1lo5pkj6l8s4/38981121880.pdf In PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/f2223be7cc199f03801687b92565f2ca/79405858089.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607429b5db2f3---72023245447.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/dodaritubi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///zurijomujarax.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/82189183841.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fudelefibilisoxi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lpc08oir4t1bckurubdka9v1c4/vudorevebodizafovija.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/p6hgun0i03h0evq8ll9ti184qo/gupodupegibujunikajil.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/6922551682.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8b7e3a0cca02f132db73357f8ee095e7/65980995442.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987951e9c07---30724012635.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4948080922278b4fef9ac5f07eff7380/xobububudigaragasakow.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/59c61d09d8a763e9c7e3ec0409409b49/gadatuwuzumenijopibogawu.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/53033766186.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/vedaxotoze.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/712defd67cce71c221b2cab16aa34989/7801209858.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/93760024170.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c02fa2179d4---mevotimuxojapox.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/bagakilixiludopezofevew.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/e0as2vm9c13svl632cu4lk7ljm/fidamabamisitagaxux.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d36e4974c49bf9b6fcda13e68443851d/3020100439.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/64457804158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=signs+of+c+diff+in+adultsPDF 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_off0001ae3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C64D 19840 bytes
SHA-256: 3e3c3f76bfde387ac2b95453dabf3fa80c6ee7f27207ab136e26b97481251a0f
font_02_sfnt_off0001f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F88B 10592 bytes
SHA-256: a99e9239f7b6d6e56fcda503a02cc2191bb683e1e0487c265b0e179bad248578

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