Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e134448ce76a79…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 01:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f17f20fb26afffa9f183683feab258d SHA-1: 2a98ef1cd1df8a546bb7e3328c1aad1672f673eb SHA-256: 15e134448ce76a794dc402b7bb678099d551bc5a6838417345f0a088fb8c2f58
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains, some of which appear to be compromised. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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 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 https://garglob.ru/uplcv?utm_term=imo+app+download+for+android+mobile+free+apk PDF link annotation
    • http://oembag.com/uploads/files/202109042153415837.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/xewomabakiwijawubibibaji.pdfIn PDF document text
    • http://glassick.com/userfiles/file/dataminebigejexaj.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/lopixezojakiduxam.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/povut.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b23cslkhh6p5hu234k068p4d6n/pinekunusolizekagukal.pdfIn PDF document text
    • https://profm.hu/files/file/suwurivisefepukenazug.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/32289488997.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/masipevapidosapa.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/57773697377.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sapawugolebavi.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/58594151980.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/de8e6bbc64f2e3e873ed8fd3f5ea1d86/16713701521.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/99467482274.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/seniniri.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/wedilagutik.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d2c9b840d8c97a665329cbc9b4ea5bc1/86997636518.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/23045767228.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc56bf415---gojutudipuxeferogulifalog.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/jepebotarunokojib.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/suwuj.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39466289393.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/matifavuxidirowip.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/17339164332.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/57202540934.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/63558333054.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_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10660 bytes
SHA-256: d3ceb8a2c5d592046468ec309381410dc01ea422f28ad8ed18ec63d5eaa5099b
font_02_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 17532 bytes
SHA-256: 654e487bcb607ee76b97fca3f87c21ac9ec420c7ec8abdeb83ca8a4c8d4f6903

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