Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbea605ea3ab7cf…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 10:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46099be798728d1b652454db9073cd94 SHA-1: 087b9d76b1ca3682ecbf3de7eef5ff3c933ed622 SHA-256: 2bbea605ea3ab7cfd3bbfbe8ae361caf836e9bce0a8fa7292db7f1f9a3169ab1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the numerous URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7997afd52---59075951930.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8mmmlm38qtu5l937slk3vl0j16/zobilipipilugibagi.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2094afa39---kuvovorotet.pdf
    • http://614move.com/clients/4890/File/rexanu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d580625862---85303175393.pdf
    • http://ggmtc.net/userfiles/files/sanonadiju.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607181b1654a6---pejezaxovoz.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077eff11aeab---76306665732.pdf
    • https://decoveinvestment.com/userfiles/file/58953999061.pdf
    • https://ctsgroups.asia/images/file/texotefunufagosexep.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084392d451cf---xigosofivozubavugexi.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45688c6bf---95808754899.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb710729d4b---wolikoj.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca0b7e099---54269967416.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0c8524569ee09c10965885f456b5efba/60388687462.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5d9d319e310b4d7ceae955ee64d2e1d/55129285269.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/votozubulelozowonefena.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6e88cdf6---43414399025.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3e0ea2b79---31276978106.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d65d14a0---56754022443.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/258958623f301c9dafec708497b3c795/5033295141.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a078bf9b1a8651ccaad01cbf0c826b2a/vogekewalaw.pdf
    • https://abofahed.com/userfiles/file/65260297445.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724d51dfdbe---lutupekunamilo.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f74120ec---jajigojekugodawax.pdf
    • http://merlegdoktor.hu/tmp/81672432152.pdf
    • https://lamthong-marchph.com/piceditor/file/zifidofimarab.pdf
    • http://botosani.ro/img/uploads/file/dexafideke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=stag+beetle+insect
    • 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_off0000f45c.bin
7842ac25f12a6d9ac35a7b195230b5eca4e5dddad13bcc64ed17487c64eae8d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10400 bytes
font_01_sfnt_off00010c02.bin
015b4a367800422151a4c30b5dda7e9543ffa77b0d48985f138a6f8b98371fbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16544 bytes
font_02_sfnt_off000136af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136AF 16792 bytes

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