Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5783c8423a0e77e…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 16:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d757f5fb8c4499b5498b98f558093963 SHA-1: 9361f20a942ed5354f642cb772b4c58e4f24c2ba SHA-256: d5783c8423a0e77ee8c49025758b7c52b81b830c717dea75eb29951ffc19dd16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The embedded URLs are likely used to redirect users to malicious destinations.

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ec2e866c---zodesikusab.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/89483491712.pdf
    • http://www.celso.org/download/84059756447.pdf
    • http://eska-lift.ru/userfiles/file/patilelireb.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608096428187b---palitaj.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6k9nt8cb5uebkj6fv1qgifl3b7/tupeberuvix.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/37ccbd03483d2b6c656fd07d02e28caf/xufumobogofij.pdf
    • http://pmmagic.vn/userfiles/file/fewikonedolutidutedipotuv.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c47d7b3076f4a7438ae77114c9a7ec09/bemob.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/38080486179.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cmikbuksd78s819usor33iko43/63382595905.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/cc3d0925b9d5909c1d8ffca0bf9823fb/11859556111.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p8538dr1easonqfv6ltv5lf1m7/33136567738.pdf
    • http://bakoca.hu/files/file/88873731575.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/lowudavigewed.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb495988a9---sexakufoxag.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5beb675236989d9232bcae7280aea9f8/juretos.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jmd5oip0ccg0kbtoc12ri0muh9/72436671583.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kjrr9l85eth385oobno3kchn12/viwopofuvovivu.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a3d710984f69a3a28d29088f932a66b0/58371521205.pdf
    • http://automsystem.com/UploadFile/file/20210626141442328.pdf
    • http://ropesadventure.com/d/files/34004146845.pdf
    • http://etasystem.net/userfiles/files/sunugixubiwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=land+price+per+acre+by+state
    • 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_off0000eccc.bin
a4041d67d55f4ceb5206b8723d590bdf30994b4a84bee5eceda226637639f031
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 18240 bytes
font_01_sfnt_off00011dad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 16792 bytes
font_02_sfnt_off000135c4.bin
b59a20a8f41794913a66c7aafc755ae276ea4f9a740741dc2919f660bef1a5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 10552 bytes