Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d54c6d1d5440a0a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 21:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d098af2c040fe4d39cb871f0b0417f8 SHA-1: 3710de0dd8670a0d3f30a6b1d440a7628d50b57e SHA-256: 9d54c6d1d5440a0affc7810a36672f17017af2eb7313abcdb772659db19b11df
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://nattukoottam.com/userfiles/file/nijutadudase.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/lobojutetizo.pdf
    • http://monteconsultants.com/image/upload/File/99937765268.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/24296575532.pdf
    • https://rintrans.com/files/48614471854.pdf
    • http://helloslow.com/data/userfiles/files/miwonidopubuxamixomibisi.pdf
    • https://czus-lukasa.sk/userfiles/file/xaxariw.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139265b3af06---8029674116.pdf
    • http://www.agot.pl/upload/file/rerinafazisil.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161399687ce41c---45838343902.pdf
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/guvumufukigudase.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7350ba1b6756146518e0f4371a7336d0/suzajup.pdf
    • https://noithatkuongthinh.com/uploads/files/98925151389.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/neromebaramegijorogofirib.pdf
    • https://xn--nmqu14inmf.com/upload/files/14823877127.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/pagetulonexilegagom.pdf
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/zebamupivaralo.pdf
    • http://annamsaigonlaw.com/upload/files/62316549577.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021090319505873499.pdf
    • http://jenistudio.com/upload/FCK/file/63409281361.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bbf75e477f90cb5d512c0062ee0e75cf/88387976572.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210910_8825762CEC67ECC3.pdf
    • https://nevjegyzek.eu/uploads/file/50624356288.pdf
    • http://hitelesen.com/userfiles/file/pidezaji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=house+party+4+123movies
    • 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_off0000de71.bin
b3404c6e7fbb3fe2a857a6f7093fc57f75403963a42b3229a3007cd934dd8919
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 10956 bytes
font_01_sfnt_off0000f818.bin
a5cf69c28107647656588940e0c003a968fb07064067be2223ca461a1f17bcf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 17072 bytes
font_02_sfnt_off00012446.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 16792 bytes