Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abf78617b84673c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 08:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c52924d18f364973eaa38a4ee13cf1f4 SHA-1: c9fad261c3581ce7d4cf3b236b603b1b75d812bd SHA-256: 1abf78617b84673c3bc681f88cae7b98c34d417d2ee6c565c274f9b89843a4e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The document body is unreadable, but the heuristics and URLs suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b1e28d1a129fb65a9c974a3b86eab523/degufezimogesivojom.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da151304---putizujukewejaluxose.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/74v0in1au7jot97t4sebv8d0f1/17455002805.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/7hqu0rlq8e7hjaplveom92le8v/45077230434.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fde4b165954---jiguwidubijiguvafiwapi.pdfIn PDF document text
    • http://greece-ex.com/lokogafovewivagazi.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/zomobifedinufevadejazisi.pdfIn PDF document text
    • https://btegypt.com/file/47479292814.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/zakudexiwavexen.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/namomijetitopibab.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/keluwora.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zebedasizipirajaf.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/11683255616.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k05bqfralt6i402hk4jlpng452/zirapokazumafuba.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/7a0d8bta1qifbu6n1s0vmn0n1o/22552986908.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080b7857e0d8---levuteniwibuzabebe.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d4768a475488c91111338e00c5a9d2f2/jigufevoto.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3cf5cb794---gokegow.pdfIn PDF document text
    • http://fygl.net/uploads/file/131806248292.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/1246644877.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/kipepadilige.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/h8f2qlp99l863auc3em2ufo2ta/nulonarusogajalefigasesub.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/luredevirigetamonag.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5786d22545---53298659706.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c81f4ff0e2aa828fb4ed9f10a431e596/kuliribelilojezuf.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c79c7d78c13db88f2a43561ca2958da7/54642369357.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/nofalumovodibodovaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+best+manual+post+hole+diggerPDF 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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16492 bytes
SHA-256: ae3042366336b443f16ce97de4bc833d4abf226c5e0d2aa4bdc3ffb72b06a51b
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 11072 bytes
SHA-256: 565bb22f19913d7a36657355e5b0e2c1a0a4354422199bf860f1f5dcae5b0e0a