Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59cbd3e015a5f1b…

MALICIOUS

PDF

88.8 KB Created: 2021-07-31 22:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7291ed5ae1317a72671b326f76febbde SHA-1: 7316d9c52905b81f2a8527187fcc768f3bbee998 SHA-256: d59cbd3e015a5f1b4aa609d9281ba9777c882bdfb9277a1a54b7ca7be1382d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators suggests the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://promise-land.com/upload/file/414682862.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e50bddd0e5677604549549cecbcf9b8/goferupukemagito.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/42696366e3073092d6ea9aac5d9b4925/12408971616.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609765ae088fd---92841049407.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/deaf196e247250990350b220fd89c8ac/binoremegeliroje.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975689ed671---zibasoxibogepifaja.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b5c26303---jemefatebu.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7a7174bd---kalumamunizudex.pdf
    • http://talleresjpg.es/img/file/28014525266.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/52508764151.pdf
    • http://technestudio.eu/userfiles/files/7040123624.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/81e3577a683e8f0b50e9f3eb71653445/16287595670.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43d72fb2dd0ccbef05458282e8192832/xivuda.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc8841f18---67919480535.pdf
    • http://guides2alpes.fr/uploads/file/65802325390.pdf
    • https://selispin.com/calisma2/files/uploads/58030187269.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p1ed5vf3u9m1cuqkc9affah1g6/74144789800.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f45eee5b---3703692270.pdf
    • http://aktifbant.com/resimler/files/43131780082.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074160a80cac---pikiwubisasalokejip.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e2d75084b---60063272389.pdf
    • http://usaoxin.com/userfiles/2021-5/file/gojuxitapoti.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3514495a---satakekupalunikab.pdf
    • http://frezerovka.by/images/fxeditor/file/veminalupatu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ejemplo+acta+constitutiva+de+una+sociedad+cooperativa+en+mexico
    • 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_off0000f293.bin
ab3fd842b0cc477dffcef983a1aab7bf2ea8a6db2fd2c5b94acdb3a93251a61a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 11056 bytes
font_01_sfnt_off00010c41.bin
8b52b60faa18612fd5d10f0aa031ad3cde809caddd02761a3a1bccd5cdb58f49
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 18204 bytes
font_02_sfnt_off00013a5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5B 16792 bytes