Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04a1b84ba421aa7…

MALICIOUS

PDF

83.2 KB Created: 2021-10-10 01:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e985c98491c99d5c6647e011f12215c SHA-1: dac05e453cb46a84421e1ad9925a4d8f1e58e823 SHA-256: d04a1b84ba421aa74abbf4e530afa1b3776c61dad9701a5293d8ddb29eed5d5d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://damsindia.org/admin/uploads/file/kijubereboxinun.pdf In PDF document text
    • https://hobbypet.cz/files/file/rigimufovivebalamibej.pdfIn PDF document text
    • http://tid.vn/upload/files/61392203561.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149f815d80e7---girepak.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/51429134579.pdfIn PDF document text
    • https://shibbirs.com/media/files/javuzufazatekopewu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/segimomumifoteseboduxan.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/minigarefuzowikiwifuji.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/koniw.pdfIn PDF document text
    • http://kbchina.de/upload/pomoba.pdfIn PDF document text
    • http://workontext.ru/media/file/96816872487.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410efb4ba0c---bolafizimamo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/37622244699.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/202195122843430.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9396c2a81f2eb120b868d8f3d79c3a39/73419430753.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/89881218675.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/55844163789.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109020012353378.pdfIn PDF document text
    • http://househouse.it/userfiles/files/60617742506.pdfIn PDF document text
    • http://rayanchem.com/d/files/muviligibud.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/vujone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=boilermaker+jobs+fly+in+fly+outPDF link annotation
    • 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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 11004 bytes
SHA-256: f35f43835129a9045ced73db026e3f053eaeddfa786a75de87f126e7bd240657
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 18404 bytes
SHA-256: 36c2c464d6265e11dc176788e863691c3e44bc111d681dd5f239edb948b15920
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1