Malicious PDF — malware analysis report

Static analysis result for SHA-256 28811c17cf088f2c…

MALICIOUS

PDF

91.5 KB Created: 2021-06-25 23:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ee3cf53434b335059271d00a39c01fd SHA-1: 8c75fc83431f8227d054bab01a40bf0fae3396ff SHA-256: 28811c17cf088f2c711ae833ec27c952be3874d102069fc3c0f29d6ddd4639ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4417d586---57563533259.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/pibenim.pdf
    • https://agentcctv.com/userfiles/file/59297831086.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/g6lh7f8tmrpnlidon0nlndbh13/gavejifuzemewutave.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143b73eb32---8923893678.pdf
    • http://avonsteel.com/UserFiles/file/53038193224.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/feba25607228d1e30b1c73a03d50f367/70788907212.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c9989fe5374---xoximazujevelemaz.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/130sbm45aohscttgb13l1qg5hi/rinagegetopoxekewizuw.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f070c6e9---49743427101.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/tukshd2lueimb8457va1m69d9k/lijilisu.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8427f861a8---gotesaves.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/781d9b46335584cde22af5df4ebbaa39/56591964469.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070814c8110d---zakijofuviwojabonewa.pdf
    • http://scales-center.com/shop/fck_file/file/velabipulisizab.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/upjmo8ek1l0j3v07i9hbl52vaa/gomusijotuz.pdf
    • http://sowa-architekci.pl/userfiles/files/renuxewelezapafaziloxa.pdf
    • http://kleiberit.ru/files/file/41351427019.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3da160ab---kibomulufeludodeg.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c8db2983---rijijamuzovaj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3e21d769---96983673921.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/k2tktuobncg280hekkrd3m5coq/63514733774.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=comparative+and+superlative+quiz+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001003b.bin
e3bade4af236c151e4af728165facc926530776ab28b60360e04aadefa1b80b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 17932 bytes
font_01_sfnt_off00012ed8.bin
06d1206aab63ba3203788d4ec3af2bb116a91b9fb1e5f19fd8f9f59e7b5fd01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 11144 bytes
font_02_sfnt_off00014892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14892 16792 bytes

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