Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfe9a31555e5cee…

MALICIOUS

PDF

89.0 KB Created: 2021-09-19 17:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85f47651d4cb5515668cb27dffab9a7c SHA-1: e14a652f48363dab384fe9a15fbdc20a4f65bbe6 SHA-256: 9dfe9a31555e5cee4cd49f95b130e4f04eddafabbb58afe4317abbc0e7c893c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, many on disposable hosting, suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://annabarons.com/files/files/mukafadufexuzujotexa.pdf In PDF document text
    • http://newworldss.com/uploads/file/wedevananaselilej.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/14719624036.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/xakeboxuwudax.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1dad76c3---78949671637.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/63088158309.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/72143669427.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/ranagijumeno.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/lolapafafamivetifiz.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/wemobuw.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/76667055277.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32044028724.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/20153564641.pdfIn PDF document text
    • http://desense.eu/uploads/wysiwyg/files/bofusumaw.pdfIn PDF document text
    • http://sayarbobinaj.com/file/dumebunesuzorolosujigu.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/vorifuxidag.pdfIn PDF document text
    • http://nemalipics.com/nikatutogit.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/rasiw.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/bevijavupurukajifuxunow.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/olktbd8u4n1eom3giftdn3t0tu/29918892443.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/62628812348.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/kikimufivalugex.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/84253507118.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/geroji.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/90687334610.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a280475f0d---judenefikuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=comic+the+walking+dead+pdfPDF 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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 17476 bytes
SHA-256: 23790c332678a9f1ea97442f11a0d4544d9025e37dddf2c9ccb8b8a30fb598d8
font_02_sfnt_off00013d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D70 11008 bytes
SHA-256: 10be1aed0785e4fde0180c5d2ac28b738b2e432c012b39131f1b3b2d8ad610db

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