Malicious PDF — malware analysis report

Static analysis result for SHA-256 653cea51220ac3df…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 20:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc263c5e2764c57a1364f8ab8ac88e1d SHA-1: ffba4fcaf36af4581b4f54cb0b827933496f3377 SHA-256: 653cea51220ac3df7c35d298d0cd4698075e8f0b1b821e4fb20dcc2193bcd1c4
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent, likely phishing or malware delivery. The primary attack vector appears to be luring users through deceptive links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=2019+corolla+se+owners+manual PDF link annotation
    • http://travelsi.ru/ckfinder/userfiles/files/zeliliviliken.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/26124291502.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/bbbk2rk5kcoenn3p4eet5e77om/gonujik.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/82010382980.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/19099068874.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122c7afa8c---genuzofopivisob.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16102568e546c1---91748729977.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e0621c31cd4a173eb8f1c82de4ce4aa4/21905611318.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gudodelazijudex.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/968bfcc1b288d05bd12a2cc06152eb41/41969275221.pdfIn PDF document text
    • https://morabia.fi/images/file/tomukusatilufogadol.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/578f3086b5cdacf246a1af07a3781d91/49859129403.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60F453B152F59.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/43301401381.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/lakopok.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07d8b9221---31974061376.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/zonuvigetiditogumebima.pdfIn PDF document text
    • http://apismorava.eu/docs/webiratomi.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210602213454.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sifafes.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/91315390581.pdfIn PDF document text
    • https://aneri12.eu/res/file/bukejisakosatib.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b64165816---maxifigunorumo.pdfIn PDF document text
    • http://ore-processing.ru/d/files/lenizoges.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119c3125b055---jisemixav.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_off0000ca0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0F 17376 bytes
SHA-256: 88a541636515078b8d2946e26f14eda63d5e625b689da4cfa6ba19a7780aa7ec
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10752 bytes
SHA-256: 0246be9ab89dd4a8dd4e9e392f7d22c870c4b5345c4ac49f1c36e57b9058f9ac
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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