Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcaeebe496e44c8…

MALICIOUS

PDF

89.3 KB Created: 2021-07-05 14:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c96084b9be4ebade2cdaacb768bd2b7 SHA-1: c38586c0536688cce4b14d5272ea56359f2773d2 SHA-256: 3dcaeebe496e44c89d091ec5dfd102ad6f1f13b98a3794dad871a32afd01953b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1415cc51---soxasol.pdf
    • http://maxidmum.com/images/upload/fck/file/11874197329.pdf
    • https://majubesar.com/contents//files/312290547.pdf
    • http://asiavent.com/UserFiles/file///rosoxum.pdf
    • http://zonazero.es/userfiles/file/ledajejuzekodabogidare.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e395f85824---60178301590.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a50af1a1f---fukiposizuvozex.pdf
    • https://vandolderskb.com/images/usr/79543987508.pdf
    • https://ukmalayalamnews.com/userfiles/file/9390457560.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1eeb2107---kixadezaleje.pdf
    • https://hostessima.pl/userfiles/file/jusebozola.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609803a36bdf9---86418363565.pdf
    • http://alltechsro.cz/files/kuresevipisudobipi.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627012026.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/845f15356f2622aa1e5106d21a4e2142/lerogaxavokapumibet.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5d035bc84a97b994610584256fa9274d/zorozudo.pdf
    • https://efficimm.fr/userfiles/files/83613469687.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bq6llbgvgd55gfh66ls5162ga7/lebuz.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c290f5da5b1---88277166269.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/16uu6rf4lrha5of9c0hs0mdsf4/49257510166.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/putulotofapedugatebut.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/49220832d0f602fb8638ad66f2115c87/65746171898.pdf
    • http://alnadaoil.com/userfiles/file/4569715079.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=premiere+transitions+free+pack
    • 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_off0000f68b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 16792 bytes
font_01_sfnt_off00010e9d.bin
4629d19932bfc311f5182e0f1e27d7aead5e2644a8068549aa2cdf0ae1db2bd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 17804 bytes
font_02_sfnt_off00013ddc.bin
887709ce9c8d093960c25c6c1453ec535bf911f382dfbaab1009b529ebf81f3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 10688 bytes