Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34814ca08511b22…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 11:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0395d31168b07bcc0b76e5b4923cc243 SHA-1: 8ceef4c2a3a6cb6b38c14e57fdd2a92a0aee5b7b SHA-256: a34814ca08511b22148db4261faf2035a069086059da230cf386ac4366d3458e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wmsone.com/eimages/file/44106384865.pdf In PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210905075825.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/lefufuwusepujosu.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/rupixekesew.pdfIn PDF document text
    • http://standardamulet.com/files/files/7454932663.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7aar1nd2vubarc6th7oeg1ibq6/wuwirofo.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/79154569169.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zuzelijotigorakasefu.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/vimapobuvalolukijelosabol.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/52617351061.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/77541563282.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/givewasabewik.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d169b4ca2e---73065316840.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/ruwovevireluwipu.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nokaruruvukexed.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/82361339528.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3204d57077f337a63a9282841ec0f25f/77043179402.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/32951540637.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/6991640348.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/pevidofejoremap.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/zimamaxuwifazox.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/11d34c795eae7d1c850c7eaaeca84892/84793318495.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/73674593742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+does+nfc+on+phone+meanPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/53300619233.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_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 18248 bytes
SHA-256: 638f30dc9b91b0e11d951d4f84d587bce0884bbb38a915c39b7a5588e468275e
font_01_sfnt_off00012b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 10640 bytes
SHA-256: 3c0e56c76a53032b6302b16f41d90c619c0fdfa7199abb5cbb42795ea718e166

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