Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0f06fa7aeb0c18…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 15:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91b70c5025fb2c8b9e576885553899e3 SHA-1: a497c7ec98e030925953e159d83b20ec0516fe51 SHA-256: dd0f06fa7aeb0c18b07ed3354126204ef76f7c380fb117781766c75becae9e71
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a visual download button lure reinforces this malicious workflow. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.frank-diagn.hu/userfiles/files/juxabalovefizowubanu.pdf
    • https://byocamacho.com/ckfinder/userfiles/files/fetoli.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e01a20c8aabb33c139a35f5234bb2121/6453658086.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161336ee0e950e---gunarug.pdf
    • http://dtmaso.com/public_html/Imagens/file/22832410959.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161308ae955ac3---77892572083.pdf
    • http://drukarnia-warszawa.pl/pliki/file/xorijidabel.pdf
    • http://hutnia.pl/userfiles/file/rijubuken.pdf
    • http://aivieksteslaivas.lv/userfiles/file/87368954801.pdf
    • http://seoulmenu.com/uploads/files/subarojukejibapax.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/49760967310.pdf
    • https://hamzakocakoglu.com/userfiles/file/74077611739.pdf
    • http://chromavials.com/d/files/8909779555.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613c54406ffa6---gorate.pdf
    • http://dispensapertutti.com/userfiles/files/wolupabuzunodofarebike.pdf
    • http://np-laser.com/upload_fck/file/2021-9-7/20210907230231855775.pdf
    • https://learningsolution.ca/userfiles/files/jimeke.pdf
    • http://termocity.by/pics/files/dijetafikemelizuro.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/tumadenajerepoturutobe.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/jajagok.pdf
    • http://jakpaisanestate.com/images/upload/files/30534716249.pdf
    • http://caythuocdangian.net/images/files/51696520806.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/76788247671.pdf
    • http://yaqeen-eg.com/userfiles/file/fenoxotalemibozanobiwa.pdf
    • http://turchifiltri.com/userfiles/files/fotuneluzug.pdf
    • http://erdemlerkoleji.com/resimler/files/tezegupigavefopas.pdf
    • http://vertracapital.com/uploads/files/gitixa.pdf
    • http://pmke.cz/pictures/files/waxokifodadu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rooter+app+free+fire
    • 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_off0000dc55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 16792 bytes
font_01_sfnt_off0000f467.bin
a41f5c70bd342763191fb02fe444481a632b246c788c1abe32070b179cc0e0db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 19632 bytes
font_02_sfnt_off000127dd.bin
a24215b1c0c64acf1c8b68d7c06b9abe0ba0829e588ab7e78247540d3d4f6c77
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 10076 bytes