Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df944c78bda6dfe…

MALICIOUS

PDF

95.4 KB Created: 2021-06-26 20:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 030c25b73e24575183e9bc4679667755 SHA-1: 0f13126dedf288dca0edf1948d132e89f11ae319 SHA-256: 0df944c78bda6dfe3c1c4f2ab47c16fe3dd819071103d59a10d115ac26dde927
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb765eb98---sovosifodufegunovavudu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d232f3e941---46772172937.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1fd3e158332cd53ade9e2d2403a55d14/kizaxukoleror.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/eddc116a48795120dd37e33a0e8e87ab/66892992592.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2ce9160c0e891be9b4ee6cef4da4d281/nufokikodofer.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607332f2e76db---lozefutefizijumolaz.pdf
    • http://alexlunacoach.com/img/editor/file/61523344384.pdf
    • http://jngf.cn/files/file/tipeguxuneledapojeki.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586257c236---30050022837.pdf
    • http://righetti-ticozzi.it/userfiles/files/49658939152.pdf
    • http://rund.cz/UserFiles/File/sunumakoxasugevamal.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/cd682934f714929648976477ea81fea4/63761633628.pdf
    • http://yi-xiang-yuan.com/CKEdit/upload/files/rugonulevalefemiz.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ekdvagmqgvfu55gre3g43vtrve/46713674039.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/dda3eed231472fb8106b39911b7cb3ed/84827481633.pdf
    • https://trouver-une-ssii.com/img/pics/files/rupegesi.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/29821822495.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/im8jn6mp1k8v8pqqk486utfht7/pipuxor.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/galokilezebe.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5c0069e3a471968dbb45d24294291c1f/64387712145.pdf
    • http://alphasigmaoverseas.com/userfiles/file/vikiju.pdf
    • http://hzzxtl.com/UploadFile/file/20210620124347444.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/95967475905.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-11/20210511182146111097.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/58c6a07ea13da89385f612cb11333e71/64777706386.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5c4c1ff56c5975727395b575c58e01c6/54051527755.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=country+road+line+dance+pdf
    • 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_off00011165.bin
1b51e2ec0e3a1a00221cdc4745f332eca8e0fba8887a70788f1ac55b08adee52
pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 10688 bytes
font_01_sfnt_off00012a0b.bin
3cc3857172767f5b8884bf4304ef9c11a0eadfe0bdb84e5033082b73315c503d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 17720 bytes
font_02_sfnt_off0001582d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1582D 16792 bytes