Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9d0b719bdb6589…

MALICIOUS

PDF

98.1 KB Created: 2021-07-20 13:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed918d86cad7c402efeedab61b57f8cd SHA-1: ed055108660f41a4dac043e9c83e2f6a9b2a13fe SHA-256: da9d0b719bdb658908cd2bbc7358c6e0aa592384adeba3f95c42e4aaf1677440
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/28605208624.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3f37957c35ce471b8f22baf0f7f1d3e4/95560596553.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c04fe6c667d---43582509496.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/kiu73r1jqjt9vb5plsv5o2thhd/rubolavexap.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dcd60b29f---siroseg.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/41b3cc5052320906794b3529e76061cd/pagemaw.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t5ahfmg3geb6ni9cd8dtkrudbk/16049059243.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed66d8256---38708222753.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/l250ci2gakk16rp52q7ff0k4ae/35112608610.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607584c070ddf---lipazovo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4bk85fbfm4j9bipddto9j24be1/20498839777.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/27809180999.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/wilekefakinopipuzonam.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///90095913389.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/poshu93sgh9q564sjacgo3v1j3/ledowazaguvakajapuxevo.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/29271008623.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/esdrpmi838ihcir57hufvf7i85/kijaxonalopifedekul.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/xazidunizigo.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160774d59383b9---xunaguxamez.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052703524538.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc35d0c5c6---bitakiwalilorasuxukatum.pdfIn PDF document text
    • https://mszukam.pl/dat//file/97394222627.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b2f252c2---86022957063.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/sofono.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7de0d06c3---74143744597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=route+2+pokemon+fire+redPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 2372 bytes
SHA-256: 76f5ad00e1a9cafe8bd932928d8b4bbaf1fef24b76150ecfe5af7d7fe2309e49
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 17428 bytes
SHA-256: 9bf5f6da3ce2cb10775a201597c9637c19060ff36dd667f121d7f018d15cd47c
font_02_sfnt_off00014a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16290 10640 bytes
SHA-256: 252d7679378ef574094057d069428d6571840a45d850194e9bbb17879b4c7499