Malicious PDF — malware analysis report

Static analysis result for SHA-256 2099b6aa47b9d741…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 08:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00a8f0837ba9d2341f0d075d9ff8df78 SHA-1: 64a0d20f4ea5552b22a1ca1adada069acc7636b4 SHA-256: 2099b6aa47b9d74111004c5116587788a661a9f09e9f23d43da862dce5e2dba5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate the presence of algorithmically generated URLs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 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 http://ihdbd.org/upload/files/12567632675.pdf In PDF document text
    • http://globomax.eu/userfiles/file/44669979467.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/bugazuvavugugofiv.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/7979240231.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/88376389475.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/lizumesofonodefuwixo.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pilovolo.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/27347681761.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109071228282200.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55e302112---xoludosalopipop.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/72867419510.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kafuwumugeforoge.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/mivasopejenefaf.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613764adb2c00---pokusukoxedanewosowef.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/10411450567.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/78445436192.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zaputidoborodobamivuveb.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/tisokowegibegodanofelewu.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/42928403876.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138a62231d54---98040438783.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xebupesijogazirolanubitiv.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d15813aa---morasinetej.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/28711446364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=machine+design+by+shigley+8th+edition+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_off0000c103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 16520 bytes
SHA-256: dceed3efaaf74f6eb6f0126d00fe3f649222a3fff572c73341b1fb5d4522332e
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 11256 bytes
SHA-256: 5de935c46f30e87f69dd6a55caccee787285a289b77030ce6b9cab342db4ac1e

Open this report in the interactive analyzer, or submit your own file for analysis.