Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1afe6ee8b05635…

MALICIOUS

PDF

109.9 KB Created: 2021-07-17 16:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4726551ff327640b0687d08b90668709 SHA-1: d31b3c5d64f35fc83f630922f205fe19d06d129b SHA-256: bb1afe6ee8b05635d9f3e2a944ac57f12fdd7a36b71d087f25d4e823cbd3006a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

Heuristics 6

  • 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 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://conelser.hu/fck_uploads/file/patawafivilugiruwifano.pdf In PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/9143489180.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/58928288020.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7442fdbef4a42f71e85eb73460a19e15/kagusoziwuda.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/83334455253.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/75681496610.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/suwimazugipafij.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/bowadepilamokuzaxuzage.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/fafetodo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/38106617614268c5b3278d563d6d14a6/newukuxepumufamuw.pdfIn PDF document text
    • http://ipublicity.cz/data/file/fedavesosudi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc444c50ea7---5719307594.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c4de5beb---52611092528.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637570fdd1---kapiwikubugawetig.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad80ba2355---ritebawinej.pdfIn PDF document text
    • http://dakmet.pl/upload/zavarixifopuxujunot.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/19346873104.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/68882949133.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1ceba81d---junaxavovele.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54768f217a---jelewizugutabevizu.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/wokojekajil.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/40642497001.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d2d3d22b---98312988702.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/173ddb56b4bf46fd4e372ec17461da31/wenelasirilivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=more+than+usual+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 10648 bytes
SHA-256: c9d86588efff3719da2a6ae39af2e44ac3df3db63f6aa86f3d728711580a76fc
font_02_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 2900 bytes
SHA-256: dd26faf120c6f2714107625cc9b302fc39778dbdcd96cfe4cf45333ceac7e599
font_03_sfnt_off0001418e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418E 20020 bytes
SHA-256: c751278584a7be1a5723c9fea4b9b2b8d948cc13b5dcb1e6c3cdb2103ee9a4b0
font_04_sfnt_off00016354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16354 28244 bytes
SHA-256: c51bd38afefa0399f34d44f7428c8908ac625b36d3a8f38c931fa23e7b99e7f3

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