Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b448b5f11db837…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 10:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b50844240db2d54f051b72e3928f33b9 SHA-1: 16c84c35891098e3c3f6c42469e8af1aa67c8966 SHA-256: 00b448b5f11db8375e6909705bee34118e9faa77145072b6fd4ebd88326d3ec3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://pistant.ru/uplcv?utm_term=15k+bloxburg+house PDF link annotation
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/buzilon.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd242eece3---24560218268.pdfIn PDF document text
    • http://yibetter.com/data/files/63708634648.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/tuloduforatikepopozewiro.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80274330094.pdfIn PDF document text
    • https://ratodua.com/contents/files/31120505069.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/61206239013.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e54fd79c7---filupa.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/66659988143.pdfIn PDF document text
    • http://104408017.linker.tw/files/xemono.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091114063773499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613460ab38910---seleguze.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/40773242047.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/53259968660.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/3741851828.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/44364478200.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/rosixibesalosakuweves.pdfIn PDF document text
    • https://alutat.com/data/file/58845766581.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140924dbba13---23209649182.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/58080206211.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pusojobojagawafizap.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/87425411350.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/34514665850.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/taxizojukamenoxebe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe64b70e71---wavufixunoroguvabulofot.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/90922503838.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/57640762981.pdfIn PDF document text
    • 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_off0000cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 10452 bytes
SHA-256: f3df489d0efa56ef39b4adac76719a25e9527f2449cb6571bc9f2a30bab4f07b
font_02_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 19072 bytes
SHA-256: 07711d21199855658936f6a2ce6e3f4a6da952783443d9050f33789e94519bea

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