Malicious PDF — malware analysis report

Static analysis result for SHA-256 63da3b7a49d0dee5…

MALICIOUS

PDF

96.2 KB Created: 2021-07-25 20:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1398ea56cd8307fe127ffc262a8c2cfc SHA-1: e02bbe45d3e934e4e37ef863264d2ec95a16341f SHA-256: 63da3b7a49d0dee560dfc264531ef5b5856935a7c6b27e3da93aabb1df30211a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to unknown PDF files hosted on various websites, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URLs are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://przychodnia-felinskiego.pl/uploads/editor/file/92453688053.pdf
    • http://masan315.net/board/imagefile/file/sidogavigibenirubatagopod.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/40957216956.pdf
    • http://alexandraharris.com/clients/36054/File/dilokavufowo.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e97e7d9ae925ae8eaa1de0ae5ff7e026/gedarimu.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2b6cdb5f---pawuduxudezovazi.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8u0nslsdb33khlk735t3pftcf2/lagizalikipigotafal.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876a477a96c---bepamamojetebupufex.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba72a946aa---girowa.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/nudabugimag.pdf
    • http://jcon-aps.dk/userfiles/file/69615644149.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2f81e780a1fd92b99d29743206981316/32536829799.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecb283d23---39919439566.pdf
    • http://metrocars.london/survey/userfiles/files/potojavifopigimoka.pdf
    • http://shuswapladystriders.ca/userfiles/file/46957941922.pdf
    • http://gesundezellen.de/neu/userfiles/file/jixisimobuvazoligede.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/tesewegogir.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a2aa95279fd534fbfb9fd45e92dbb956/30878738296.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074606d47a6a---94177746976.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/dizari.pdf
    • http://textingrights.com/userfiles/files/zuridebivobosasaguzopu.pdf
    • http://driscollandgibson.com/images/edit_images/file/dibafupaviwu.pdf
    • http://forter.vn/hinhanh/file/16024583323.pdf
    • http://prmakeup.com/Image/files/88182011868.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/99252265972.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=please+define+c+wright+mills+sociological+imagination
    • 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_off00011404.bin
6a7913da1ab97a8a97e28fc1bcbecd7fd5f0eeabedac6dc524ed0e08988afbc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 11008 bytes
font_01_sfnt_off00012d41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 16792 bytes
font_02_sfnt_off00014553.bin
41bbc2ac7c513c05508e737609378655f00645d5b805b90e88b72b912a9aa362
pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 17300 bytes