Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1da1ee51fea1e7…

MALICIOUS

PDF

87.1 KB Created: 2021-08-24 23:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a37c6870681439953549fa30a79dd9be SHA-1: e97ee256add84abb2de2a7c956526cec0f042148 SHA-256: 5d1da1ee51fea1e705b4607c30a5b8a918983d3e2c0163b09608543cfdfcf7bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and functions as a link farm on compromised or disposable hosting. The embedded JavaScript likely serves to facilitate redirection to malicious content, a common tactic in phishing campaigns. The presence of numerous URLs pointing to various domains, many associated with compromised CMS uploads or disposable hosting, further supports the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=anxious+resistant+attachment PDF link annotation
    • https://pametnidom.hr/pametne_kuce/userfiles/file/90666980737.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/dexixazifisotixodazajam.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/sobogavafosavomifuxu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9de6446c3ef1c85cd16ef9e42c2c3f4a/88779172812.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/73803305944.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/51638389217.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-3/20210803183412684553.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c9e801ba3a7d130b25865d51a332caaf/48587863690.pdfIn PDF document text
    • https://tmtteks.com/files/ravijuxid.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/jirixozabej.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gn12n3qd4nn6tg2mpiridmn141/zedofitakunipesaguzili.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/40285434823.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/mazodomu.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/toxisopuleva.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f2kcgotf86rj2d0s169gbf1lpk/72682047498.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/47756716430.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/mhto7bacosdia0jn9a09j9ppn6/mujotufetixi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc055055b---54253035955.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/59559293389.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088279b5d4ef---segunesiduzegegupulim.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375953c1e8---70769811354.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9424db0acaa8a0744528ae507980c8b4/11476558315.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e51041b708d---dagorobagipezepasuku.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/gogowoze.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_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 16432 bytes
SHA-256: 626cb8d551753f022dc7a6eaa32f0ef00f5d2beff73bfc9f39970ba3a00ef8d3
font_01_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001360a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 10632 bytes
SHA-256: db8a88fc8ae1f9b7f8defde3bb9e68601976505d23aebe68bcc8280264915fb1