Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaabc68ae31736c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 04:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c8247255ad087f1e5fcce4158fa84e5 SHA-1: 06e8d5eb086c0fb32c15d1bec7456caa6b7c02d2 SHA-256: 1aaabc68ae31736c37d0fd152c8df0aa854588c45795a79104a191703e36a7e3
164 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown-reputation URLs strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=entity+framework+book+pdf PDF link annotation
    • http://perfect-gallery.com/userfiles/file/dapet.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/gopobubudul.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/85325684787.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/57639769756.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/93976006483.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niserimedugabiniluwolujon.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/jofubowulumuwaxibi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85aabb6d3---67489089598.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d4422c89aff8b59058047c800d37001c/50030896344.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/bokikemij.pdfIn PDF document text
    • https://mimpidia.com/contents/files/34035402719.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/josolavozaxolaverip.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/64316276711.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d22f734ff79df6ad5af96209505186ed/23800597527.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dixetaledife.pdfIn PDF document text
    • http://napiarsaigh.com/images/suwizab.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/kosimuzamitifogu.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/62120366721.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///48352253119.pdfIn PDF document text
    • http://hidramaco.com/files/files/gagasamuvipesug.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c15f389bbe---29240459001.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/lekugobiwobemovopavewaros.pdfIn PDF document text
    • https://jobtiara.com/files/files/5716143573.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/toxabidad.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/16969011931.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 10860 bytes
SHA-256: 2c95a47218857284f10a74ac0fe81767ac6ec81bdfbc1974fc76ac352fd17c39
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 18316 bytes
SHA-256: fc02dd7ecc2cf8ffe71f08f2d65f8ac7669c1363a06cbbfc37c2105715abeb14
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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