Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94b071d56f1b1a3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 11:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb0a5e974943aa5e94bf864c6f036e33 SHA-1: c55479913e6a32aa706e1ed8a0dd0f82bbda2af2 SHA-256: b94b071d56f1b1a399e313be65ab2de247604a0e491417fac754acdde5a41846
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates it's designed to trick users into clicking an action trigger. The numerous extracted URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a campaign to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=benefits+of+taking+a+break+from+technology PDF link annotation
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/toxavuwob.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/14165135812.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/jomokedumelipa.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/46507755914.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/5363511268.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/47522025380.pdfIn PDF document text
    • http://samtle.net/ckupload/files/muvivelipepixuxawazadedon.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/173542284449007a483be495cc22d056/nubugefixas.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/xasiribugowut.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ro2siimak0r6dfeh8239tuslru/34021752033.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210928/file/69265486912.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/wavesabipikedofajibil.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/47845852164.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5eeda3f4d---2048071690.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/14073999012.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/85670505480.pdfIn PDF document text
    • http://schubert-hh.de/image/file/jonanuporakuwiwulisama.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/11486503244.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a7bc52b9---xawaboboxolojalode.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/polukefajob.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/41128041282.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/nopabisu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/napodavunujitijamijow.pdfIn PDF document text
    • https://ebooksweb.net/files/file/679744002.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_off0000ae84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE84 14124 bytes
SHA-256: 2076afdaa2f9dc2f8d7019f7f08e7684e757676c6a890ee42ad3896f5c1d4641
font_01_sfnt_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 11184 bytes
SHA-256: 1689c3457f6dd583d0b8d22e0d9f47448feb9fe2d35e0fdf753ae81d44e704f3

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