Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cb4b1ea1407b16…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 03:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae8b99706ff7cb7a74a0f093e6dc37e3 SHA-1: 08a5f6cc2cf744433b470cf25e0df83b00105571 SHA-256: b7cb4b1ea1407b16d33f7c867c6dc38babe4b415b3d4f162c8194aa0f330aef8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The presence of a PDF_RANDOM_URL_LINK heuristic and ClamAV detection as Pdf.Phishing.Trojan strongly suggests a phishing or malware distribution campaign. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ad3942981458e1b9b46c673d81849a52/pibolewavanilobopozi.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9350012806ba2f33d0628df53ac3e513/34751926789.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730c6cc7b25---kenexa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed0136fe6---limanugopufifebeza.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f028e8a5c3---xiludaza.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/nanapuzedejakarokudi.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/40ab48e3fac071a00def289c8ab6b0c1/86348342075.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/tulitiweri.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c6e5b6d6---12768633600.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/zuxifu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0892ebfe11---65091115403.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/18513834423.pdfIn PDF document text
    • https://btegypt.com/file/pefonigelizutekubujotowe.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/tediremupo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f45bceb9---mebinekomomekexijokujedu.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/20631300061.pdfIn PDF document text
    • http://methese.com/upload/files/devebonimelamomon.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/sopepuvig.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/lepelaropiwijodele.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/2336063467.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/rebigononapuwexaxufakeg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lhu6qdphdaghu7pigegdupp0i6/doxowubolaxo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ac8pnbrn561clt91h6nebuosu6/56131146381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=i+am+joaquin+poem+meaningPDF 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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 19760 bytes
SHA-256: 3da40c70e7c4a5f4bb802a292f8b9b2a8f56897831688767b37d836d828384f8
font_01_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 10512 bytes
SHA-256: c972fb32458c26878b9ca35c94174b5a2c4b5a7693394ba03857300754a31b15

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