Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b15aead966bc654…

MALICIOUS

PDF

78.4 KB Created: 2021-07-22 22:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 44bb096d5ea960722291eec5138fdce5 SHA-1: 28e5bb097a9c965a9be95d82fee59589789cd66b SHA-256: 2b15aead966bc654acfa33f01def478ca0afda21bfe580c285cb409cc2a65134
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3b6ab10e7f4b67c55e6e4687d742b11d/71812707743.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lj9qdjjotiijds4v58ktln07de/xetikesivanelovuvutagemi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b3217a037---voparabozowumajukodilevov.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/zevavopotex.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/kuzeposexafupirivanuti.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/tawisiwajolis.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/f78ffq4skkm9e9t18eb1c3r7bh/53550177196.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/lapikimuliwapitiwilijo.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/45331332735.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/26987855173.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d19fa1a59a0---pefez.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/45617912915.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/tvn3ntbfg0j7brqsfioa2o7c62/garafopewikuz.pdfIn PDF document text
    • http://millecolori.it/images/file/sorasa.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/fd62a1ad7af28c090de43c1b3cd0589f/toranajipibiveg.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/sagom.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/jevinibef.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f95770d0c4672b290368765625850b64/22308549688.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3cea995249f9352639a6e05a8c5bc639/50813667243.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0e196a8e2d8cf3eadf79400e3730ab55/ligolimorunirudejejaz.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/4256557705.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/92960211268.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/1020510714.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/31939159290.pdfIn PDF document text
    • https://avenue102.com/uploads/file/5002921478.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a50d4baa---borewef.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732e1cb183c---foruzigarokavebive.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/ranakudufoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=research+methods+in+the+social+sciences+frankfort+nachmias+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 18792 bytes
SHA-256: 90222e4d945eaa25705a37275594cb281afa032320fc7f7e2fc2ad8e5f471673
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 11020 bytes
SHA-256: 059dc1583a7d31c8909e83e284535da74df407a5fa6a369a9f1ea6cc036aa638