Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f04dfb83ed58433…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 21:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b44c6216f8343c151d167db84095f773 SHA-1: 0c326a84b023414c2a45f63f2100daa889533873 SHA-256: 3f04dfb83ed5843348dbca062346666a73e778d9646b2dbf1542728bc429ebbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://creteservices.com/FCKeditor/userimages/file/97966805829.pdf
    • http://akinmedikal.com/uploads/file/1214196089.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/082d1669965f20f32d015a10a22d874d/jiwezexeku.pdf
    • https://eurocomm-italia.com/file/mejow.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mbe4ttrc6oi5bj4favsv6o1bt6/98690170622.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6c7e674bfba49e216adfbbebe1dad9e9/zepifilogiweradunotukebop.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ce5999e7---daratopuvutedipeladig.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b994d0345a8---setuxezeruram.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94cb8ad9a8---buvazotanoxokonodij.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9a867f09---belixokifemapomi.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607161a9e27eb---2331653309.pdf
    • https://foodvellythailand.com/upload/files/zifadosagememisakos.pdf
    • http://webursitet.org/Files/file/kederinizinutin.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jinivagalunoxuriga.pdf
    • https://muratay.nl/userfiles/file/56063443725.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/tuzadosotuverab.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0d747d10726309acfd96a4a1b59f9991/93779323096.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/66115467095.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7d0ntv4aqh1is5icmjubmph0hn/kisevogenawawu.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c242eab7555---72694931032.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc18ae21e5---57640372313.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gs3crfkb0vf1untfqkipg2vh5c/3713132408.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076369d1b54f---wozupuguxevatopu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thermometer+lab+use
    • 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_off0000f36b.bin
961772d7599138147a6a849f8f109b78bbc10f2510287342071ae97a24fd6624
pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 17672 bytes
font_01_sfnt_off0001222c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 16792 bytes
font_02_sfnt_off00013a43.bin
1dfc1541e58bf860d625cc3be764be4832f5c53ca4ca6df4af852129bb9174e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 10380 bytes